[kwin] /: Remove disabled TabGroup feature

Frederik Gladhorn null at kde.org
Sat Sep 14 09:58:53 BST 2019


Git commit b64e67ce7c0c0e65f4450eefb2b680e2c5933413 by Frederik Gladhorn.
Committed on 14/09/2019 at 08:58.
Pushed by gladhorn into branch 'master'.

Remove disabled TabGroup feature

Summary:
This has been commented out since 2014, I doubt it will come back.
This is a big amount of code, maintenance will be easier without it.

Reviewers: #kwin, zzag

Reviewed By: #kwin, zzag

Subscribers: romangg, graesslin, kwin

Tags: #kwin, #documentation

Differential Revision: https://phabricator.kde.org/D23069

M  +0    -1    CMakeLists.txt
M  +2    -102  abstract_client.cpp
M  +2    -59   abstract_client.h
M  +0    -11   activation.cpp
M  +0    -1    atoms.cpp
M  +0    -1    atoms.h
M  +6    -46   client.cpp
M  +1    -6    client.h
M  +0    -2    deleted.cpp
M  +0    -4    deleted.h
M  +4    -18   doc/windowbehaviour/index.docbook
M  +7    -3    effects.cpp
M  +0    -4    effects/desktopgrid/desktopgrid.cpp
M  +0    -2    effects/flipswitch/flipswitch.cpp
M  +1    -3    effects/highlightwindow/highlightwindow.cpp
M  +1    -5    effects/presentwindows/presentwindows.cpp
M  +1    -1    effects/slideback/slideback.cpp
M  +5    -65   geometry.cpp
M  +1    -1    input.cpp
M  +0    -5    kcmkwin/kwinoptions/actions.ui
M  +1    -38   kcmkwin/kwinoptions/advanced.ui
M  +6    -10   kcmkwin/kwinoptions/mouse.cpp
M  +0    -35   kcmkwin/kwinoptions/mouse.ui
M  +0    -32   kcmkwin/kwinoptions/windows.cpp
M  +0    -3    kcmkwin/kwinoptions/windows.h
M  +3    -3    kwin.kcfg
M  +0    -4    kwinbindings.cpp
M  +0    -6    layers.cpp
M  +2    -1    libkwineffects/kwineffects.h
M  +0    -104  manage.cpp
M  +4    -41   options.cpp
M  +5    -35   options.h
M  +0    -2    placement.cpp
M  +0    -2    scene.cpp
M  +0    -2    scene.h
M  +0    -5    scripting/scripting_model.cpp
M  +2    -3    shell_client.cpp
M  +0    -13   sm.cpp
M  +0    -2    sm.h
D  +0    -360  tabgroup.cpp
D  +0    -209  tabgroup.h
M  +0    -4    toplevel.cpp
M  +1    -180  useractions.cpp
M  +0    -40   useractions.h
M  +1    -4    workspace.cpp
M  +0    -4    workspace.h

https://commits.kde.org/kwin/b64e67ce7c0c0e65f4450eefb2b680e2c5933413

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f7d85a419..6f71996c3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -395,7 +395,6 @@ set(kwin_KDEINIT_SRCS
    client_machine.cpp
    cursor.cpp
    debug_console.cpp
-   tabgroup.cpp
    focuschain.cpp
    globalshortcuts.cpp
    input.cpp
diff --git a/abstract_client.cpp b/abstract_client.cpp
index 98779e29f..f1811891f 100644
--- a/abstract_client.cpp
+++ b/abstract_client.cpp
@@ -32,7 +32,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "tabbox.h"
 #endif
 #include "screenedge.h"
-#include "tabgroup.h"
 #include "useractions.h"
 #include "workspace.h"
 
@@ -125,96 +124,11 @@ bool AbstractClient::isTransient() const
     return false;
 }
 
-void AbstractClient::setTabGroup(TabGroup* group)
-{
-    tab_group = group;
-    emit tabGroupChanged();
-}
-
 void AbstractClient::setClientShown(bool shown)
 {
     Q_UNUSED(shown)
 }
 
-bool AbstractClient::untab(const QRect &toGeometry, bool clientRemoved)
-{
-    TabGroup *group = tab_group;
-    if (group && group->remove(this)) { // remove sets the tabgroup to "0", therefore the pointer is cached
-        if (group->isEmpty()) {
-            delete group;
-        }
-        if (clientRemoved)
-            return true; // there's been a broadcast signal that this client is now removed - don't touch it
-        setClientShown(!(isMinimized() || isShade()));
-        bool keepSize = toGeometry.size() == size();
-        bool changedSize = false;
-        if (quickTileMode() != QuickTileMode(QuickTileFlag::None)) {
-            changedSize = true;
-            setQuickTileMode(QuickTileFlag::None); // if we leave a quicktiled group, assume that the user wants to untile
-        }
-        if (toGeometry.isValid()) {
-            if (maximizeMode() != MaximizeRestore) {
-                changedSize = true;
-                maximize(MaximizeRestore); // explicitly calling for a geometry -> unmaximize
-            }
-            if (keepSize && changedSize) {
-                setGeometryRestore(geometry()); // checkWorkspacePosition() invokes it
-                QPoint cpoint = Cursor::pos();
-                QPoint point = cpoint;
-                point.setX((point.x() - toGeometry.x()) * geometryRestore().width() / toGeometry.width());
-                point.setY((point.y() - toGeometry.y()) * geometryRestore().height() / toGeometry.height());
-                auto geometry_restore = geometryRestore();
-                geometry_restore.moveTo(cpoint-point);
-                setGeometryRestore(geometry_restore);
-            } else {
-                setGeometryRestore(toGeometry); // checkWorkspacePosition() invokes it
-            }
-            setGeometry(geometryRestore());
-            checkWorkspacePosition();
-        }
-        return true;
-    }
-    return false;
-}
-
-bool AbstractClient::tabTo(AbstractClient *other, bool behind, bool activate)
-{
-    Q_ASSERT(other && other != this);
-
-    if (tab_group && tab_group == other->tabGroup()) { // special case: move inside group
-        tab_group->move(this, other, behind);
-        return true;
-    }
-
-    GeometryUpdatesBlocker blocker(this);
-    const bool wasBlocking = signalsBlocked();
-    blockSignals(true); // prevent client emitting "retabbed to nowhere" cause it's about to be entabbed the next moment
-    untab();
-    blockSignals(wasBlocking);
-
-    TabGroup *newGroup = other->tabGroup() ? other->tabGroup() : new TabGroup(other);
-
-    if (!newGroup->add(this, other, behind, activate)) {
-        if (newGroup->count() < 2) { // adding "c" to "to" failed for whatever reason
-            newGroup->remove(other);
-            delete newGroup;
-        }
-        return false;
-    }
-    return true;
-}
-
-void AbstractClient::syncTabGroupFor(QString property, bool fromThisClient)
-{
-    if (tab_group)
-        tab_group->sync(property.toLatin1().data(), fromThisClient ? this : tab_group->current());
-}
-
-bool AbstractClient::isCurrentTab() const
-{
-    return !tab_group || tab_group->current() == this;
-}
-
 MaximizeMode AbstractClient::requestedMaximizeMode() const
 {
     return maximizeMode();
@@ -1195,14 +1109,6 @@ bool AbstractClient::performMouseCommand(Options::MouseCommand cmd, const QPoint
         if (!isDesktop())   // No point in changing the opacity of the desktop
             setOpacity(qMax(opacity() - 0.1, 0.1));
         break;
-    case Options::MousePreviousTab:
-        if (tabGroup())
-            tabGroup()->activatePrev();
-    break;
-    case Options::MouseNextTab:
-        if (tabGroup())
-            tabGroup()->activateNext();
-    break;
     case Options::MouseClose:
         closeWindow();
         break;
@@ -1258,7 +1164,6 @@ bool AbstractClient::performMouseCommand(Options::MouseCommand cmd, const QPoint
         updateCursor();
         break;
     }
-    case Options::MouseDragTab:
     case Options::MouseNothing:
     default:
         replay = true;
@@ -1405,10 +1310,6 @@ void AbstractClient::updateGeometryBeforeUpdateBlocking()
     m_geometryBeforeUpdateBlocking = geometry();
 }
 
-void AbstractClient::updateTabGroupStates(TabGroup::States)
-{
-}
-
 void AbstractClient::doMove(int, int)
 {
 }
@@ -1742,8 +1643,8 @@ bool AbstractClient::processDecorationButtonPress(QMouseEvent *event, bool ignor
         com = active ? options->commandActiveTitlebar3() : options->commandInactiveTitlebar3();
     if (event->button() == Qt::LeftButton
             && com != Options::MouseOperationsMenu // actions where it's not possible to get the matching
-            && com != Options::MouseMinimize  // mouse release event
-            && com != Options::MouseDragTab) {
+            && com != Options::MouseMinimize)  // mouse release event
+    {
         setMoveResizePointerMode(mousePosition());
         setMoveResizePointerButtonDown(true);
         setMoveOffset(event->pos());
@@ -1763,7 +1664,6 @@ bool AbstractClient::processDecorationButtonPress(QMouseEvent *event, bool ignor
                com == Options::MouseActivate ||
                com == Options::MouseActivateRaiseAndPassClick ||
                com == Options::MouseActivateAndPassClick ||
-               com == Options::MouseDragTab ||
                com == Options::MouseNothing);
 }
 
diff --git a/abstract_client.h b/abstract_client.h
index db0c1cfd4..f4213ab5f 100644
--- a/abstract_client.h
+++ b/abstract_client.h
@@ -23,7 +23,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "toplevel.h"
 #include "options.h"
 #include "rules.h"
-#include "tabgroup.h"
 #include "cursor.h"
 
 #include <memory>
@@ -75,12 +74,6 @@ class KWIN_EXPORT AbstractClient : public Toplevel
      */
     Q_PROPERTY(bool fullScreenable READ isFullScreenable)
 
-    /**
-     * Whether this Client is the currently visible Client in its Client Group (Window Tabs).
-     * For change connect to the visibleChanged signal on the Client's Group.
-     */
-    Q_PROPERTY(bool isCurrentTab READ isCurrentTab)
-
     /**
      * Whether this Client is active or not. Use Workspace::activateClient() to activate a Client.
      * @see Workspace::activateClient
@@ -318,11 +311,6 @@ class KWIN_EXPORT AbstractClient : public Toplevel
      */
     Q_PROPERTY(bool unresponsive READ unresponsive NOTIFY unresponsiveChanged)
 
-    /**
-     * The "Window Tabs" Group this Client belongs to.
-     */
-    Q_PROPERTY(KWin::TabGroup* tabGroup READ tabGroup NOTIFY tabGroupChanged SCRIPTABLE false)
-
     /**
      * The color scheme set on this client
      * Absolute file path, or name of palette in the user's config directory following KColorSchemes format.
@@ -494,36 +482,9 @@ public:
         return m_minimized;
     }
     virtual void setFullScreen(bool set, bool user = true) = 0;
-    // Tabbing functions
-    Q_INVOKABLE inline bool tabBefore(AbstractClient *other, bool activate) { return tabTo(other, false, activate); }
-    Q_INVOKABLE inline bool tabBehind(AbstractClient *other, bool activate) { return tabTo(other, true, activate); }
-    /**
-     * Syncs the *dynamic* @p property @p fromThisClient or the currentTab() to
-     * all members of the tabGroup() (if there is one)
-     *
-     * eg. if you call:
-     * @code
-     * client->setProperty("kwin_tiling_floats", true);
-     * client->syncTabGroupFor("kwin_tiling_floats", true)
-     * @endcode
-     * all clients in this tabGroup will have property("kwin_tiling_floats").toBool() == true
-     *
-     * WARNING: non dynamic properties are ignored - you're not supposed to alter/update such explicitly
-     */
-    Q_INVOKABLE void syncTabGroupFor(QString property, bool fromThisClient = false);
-    TabGroup *tabGroup() const;
-    /**
-     * Set tab group - this is to be invoked by TabGroup::add/remove(client) and NO ONE ELSE
-     */
-    void setTabGroup(TabGroup* group);
+
     virtual void setClientShown(bool shown);
-    Q_INVOKABLE bool untab(const QRect &toGeometry = QRect(), bool clientRemoved = false);
-    /**
-     * When a click is done in the decoration and it calls the group
-     * to change the visible client it starts to move-resize the new
-     * client, this function stops it.
-     */
-    bool isCurrentTab() const;
+
     virtual QRect geometryRestore() const = 0;
     /**
      * The currently applied maximize mode
@@ -917,11 +878,6 @@ Q_SIGNALS:
     void hasApplicationMenuChanged(bool);
     void applicationMenuActiveChanged(bool);
     void unresponsiveChanged(bool);
-    /**
-     * Emitted whenever the Client's TabGroup changed. That is whenever the Client is moved to
-     * another group, but not when a Client gets added or removed to the Client's ClientGroup.
-     */
-    void tabGroupChanged();
 
 protected:
     AbstractClient();
@@ -1053,13 +1009,6 @@ protected:
      */
     void addRepaintDuringGeometryUpdates();
 
-    /**
-     * Convenient method to update the TabGroup states if there is one present.
-     * Marked as virtual as TabGroup does not yet handle AbstractClient, but only
-     * subclasses of AbstractClient. Given that the default implementation does nothing.
-     */
-    virtual void updateTabGroupStates(TabGroup::States states);
-
     /**
      * @returns whether the Client is currently in move resize mode
      */
@@ -1303,7 +1252,6 @@ private:
     QKeySequence _shortcut;
 
     WindowRules m_rules;
-    TabGroup* tab_group = nullptr;
 
     static bool s_haveResizeEffect;
 };
@@ -1371,11 +1319,6 @@ inline void AbstractClient::setPendingGeometryUpdate(PendingGeometry_t update)
     m_pendingGeometryUpdate = update;
 }
 
-inline TabGroup* AbstractClient::tabGroup() const
-{
-    return tab_group;
-}
-
 }
 
 Q_DECLARE_METATYPE(KWin::AbstractClient*)
diff --git a/activation.cpp b/activation.cpp
index 14dfcd45d..9ffe34450 100644
--- a/activation.cpp
+++ b/activation.cpp
@@ -388,8 +388,6 @@ void Workspace::takeActivity(AbstractClient* c, ActivityFlags flags)
         }
         flags &= ~ActivityFocus;
     }
-    if (c->tabGroup() && c->tabGroup()->current() != c)
-        c->tabGroup()->setCurrent(c);
     if (!c->isShown(true)) {  // shouldn't happen, call activateClient() if needed
         qCWarning(KWIN_CORE) << "takeActivity: not shown" ;
         return;
@@ -466,15 +464,6 @@ bool Workspace::activateNextClient(AbstractClient* c)
 
     AbstractClient* get_focus = NULL;
 
-    // precedence on keeping the current tabgroup active. to the user that's the same window
-    if (c && c->tabGroup() && c->isShown(false)) {
-        if (c == c->tabGroup()->current())
-            c->tabGroup()->activateNext();
-        get_focus = c->tabGroup()->current();
-        if (get_focus == c) // single tab case - should not happen
-            get_focus = NULL;
-    }
-
     const int desktop = VirtualDesktopManager::self()->current();
 
     if (!get_focus && showingDesktop())
diff --git a/atoms.cpp b/atoms.cpp
index 86540ab47..9e6562445 100644
--- a/atoms.cpp
+++ b/atoms.cpp
@@ -60,7 +60,6 @@ Atoms::Atoms()
     , net_wm_sync_request_counter(QByteArrayLiteral("_NET_WM_SYNC_REQUEST_COUNTER"))
     , net_wm_sync_request(QByteArrayLiteral("_NET_WM_SYNC_REQUEST"))
     , kde_net_wm_shadow(QByteArrayLiteral("_KDE_NET_WM_SHADOW"))
-    , kde_net_wm_tab_group(QByteArrayLiteral("_KDE_NET_WM_TAB_GROUP"))
     , kde_first_in_window_list(QByteArrayLiteral("_KDE_FIRST_IN_WINDOWLIST"))
     , kde_color_sheme(QByteArrayLiteral("_KDE_NET_WM_COLOR_SCHEME"))
     , kde_skip_close_animation(QByteArrayLiteral("_KDE_NET_WM_SKIP_CLOSE_ANIMATION"))
diff --git a/atoms.h b/atoms.h
index cb1bd60b4..e31f5adad 100644
--- a/atoms.h
+++ b/atoms.h
@@ -69,7 +69,6 @@ public:
     Xcb::Atom net_wm_sync_request_counter;
     Xcb::Atom net_wm_sync_request;
     Xcb::Atom kde_net_wm_shadow;
-    Xcb::Atom kde_net_wm_tab_group;
     Xcb::Atom kde_first_in_window_list;
     Xcb::Atom kde_color_sheme;
     Xcb::Atom kde_skip_close_animation;
diff --git a/client.cpp b/client.cpp
index 9e4f036bf..04557aac9 100644
--- a/client.cpp
+++ b/client.cpp
@@ -170,17 +170,6 @@ Client::Client()
         }
     });
 
-    connect(this, &Client::tabGroupChanged, this,
-        [this] {
-            auto group = tabGroup();
-            if (group) {
-                unsigned long data[] = {qHash(group)}; //->id();
-                m_client.changeProperty(atoms->kde_net_wm_tab_group, XCB_ATOM_CARDINAL, 32, 1, data);
-            }
-            else
-                m_client.deleteProperty(atoms->kde_net_wm_tab_group);
-        });
-
     // SELI TODO: Initialize xsizehints??
 }
 
@@ -257,8 +246,7 @@ void Client::releaseWindow(bool on_shutdown)
         // Only when the window is being unmapped, not when closing down KWin (NETWM sections 5.5,5.7)
         info->setDesktop(0);
         info->setState(0, info->state());  // Reset all state flags
-    } else
-        untab();
+    }
     xcb_connection_t *c = connection();
     m_client.deleteProperty(atoms->kde_net_wm_user_creation_time);
     m_client.deleteProperty(atoms->net_frame_extents);
@@ -614,7 +602,7 @@ bool Client::noBorder() const
 
 bool Client::userCanSetNoBorder() const
 {
-    return !isFullScreen() && !isShade() && !tabGroup();
+    return !isFullScreen() && !isShade();
 }
 
 void Client::setNoBorder(bool set)
@@ -774,9 +762,6 @@ void Client::doMinimize()
     updateVisibility();
     updateAllowedActions();
     workspace()->updateMinimizedOfTransients(this);
-    // Update states of all other windows in this group
-    if (tabGroup())
-        tabGroup()->updateStates(this, TabGroup::Minimized);
 }
 
 QRect Client::iconGeometry() const
@@ -826,10 +811,6 @@ void Client::setShade(ShadeMode mode)
         decoration->borders(border_left, border_right, border_top, border_bottom);
 #endif
 
-    // Update states of all other windows in this group
-    if (tabGroup())
-        tabGroup()->updateStates(this, TabGroup::Shaded);
-
     if (was_shade == isShade()) {
         // Decoration may want to update after e.g. hover-shade changes
         emit shadeChanged();
@@ -912,9 +893,7 @@ void Client::shadeHover()
 
 void Client::shadeUnhover()
 {
-    if (!tabGroup() || tabGroup()->current() == this ||
-        tabGroup()->current()->shadeMode() == ShadeNormal)
-        setShade(ShadeNormal);
+    setShade(ShadeNormal);
     cancelShadeHoverTimer();
 }
 
@@ -934,7 +913,7 @@ void Client::updateVisibility()
 {
     if (deleting)
         return;
-    if (hidden && isCurrentTab()) {
+    if (hidden) {
         info->setState(NET::Hidden, NET::Hidden);
         setSkipTaskbar(true);   // Also hide from taskbar
         if (compositing() && options->hiddenPreviews() == HiddenPreviewsAlways)
@@ -943,8 +922,7 @@ void Client::updateVisibility()
             internalHide();
         return;
     }
-    if (isCurrentTab())
-        setSkipTaskbar(originalSkipTaskbar());   // Reset from 'hidden'
+    setSkipTaskbar(originalSkipTaskbar());   // Reset from 'hidden'
     if (isMinimized()) {
         info->setState(NET::Hidden, NET::Hidden);
         if (compositing() && options->hiddenPreviews() == HiddenPreviewsAlways)
@@ -1270,10 +1248,6 @@ void Client::doSetDesktop(int desktop, int was_desk)
     Q_UNUSED(desktop)
     Q_UNUSED(was_desk)
     updateVisibility();
-
-    // Update states of all other windows in this group
-    if (tabGroup())
-        tabGroup()->updateStates(this, TabGroup::Desktop);
 }
 
 /**
@@ -1377,10 +1351,6 @@ void Client::updateActivities(bool includeTransients)
     FocusChain::self()->update(this, FocusChain::MakeFirst);
     updateVisibility();
     updateWindowRules(Rules::Activity);
-
-    // Update states of all other windows in this group
-    if (tabGroup())
-        tabGroup()->updateStates(this, TabGroup::Activity);
 }
 
 /**
@@ -1596,8 +1566,6 @@ void Client::setClientShown(bool shown)
     if (shown != hidden)
         return; // nothing to change
     hidden = !shown;
-    if (options->isInactiveTabsSkipTaskbar())
-        setSkipTaskbar(hidden); // TODO: Causes reshuffle of the taskbar
     if (shown) {
         map();
         takeFocus();
@@ -1606,8 +1574,7 @@ void Client::setClientShown(bool shown)
     } else {
         unmap();
         // Don't move tabs to the end of the list when another tab get's activated
-        if (isCurrentTab())
-            FocusChain::self()->update(this, FocusChain::MakeLast);
+        FocusChain::self()->update(this, FocusChain::MakeLast);
         addWorkspaceRepaint(visibleRect());
     }
 }
@@ -2106,13 +2073,6 @@ bool Client::belongsToSameApplication(const AbstractClient *other, SameApplicati
     return Client::belongToSameApplication(this, c2, checks);
 }
 
-void Client::updateTabGroupStates(TabGroup::States states)
-{
-    if (auto t = tabGroup()) {
-        t->updateStates(this, states);
-    }
-}
-
 QSize Client::resizeIncrements() const
 {
     return m_geometryHints.resizeIncrements();
diff --git a/client.h b/client.h
index 58f050ce7..0bf24baa1 100644
--- a/client.h
+++ b/client.h
@@ -25,7 +25,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 // kwin
 #include "options.h"
 #include "rules.h"
-#include "tabgroup.h"
 #include "abstract_client.h"
 #include "xcbutils.h"
 // Qt
@@ -346,8 +345,6 @@ private:
     bool buttonReleaseEvent(xcb_window_t w, int button, int state, int x, int y, int x_root, int y_root);
     bool motionNotifyEvent(xcb_window_t w, int state, int x, int y, int x_root, int y_root);
 
-    Client* findAutogroupCandidate() const;
-
 protected:
     void debug(QDebug& stream) const override;
     void addDamage(const QRegion &damage) override;
@@ -362,7 +359,6 @@ protected:
     void doSetSkipSwitcher() override;
     bool belongsToDesktop() const override;
     void setGeometryRestore(const QRect &geo) override;
-    void updateTabGroupStates(TabGroup::States states) override;
     void doMove(int x, int y) override;
     bool doStartMoveResize() override;
     void doPerformMoveResize() override;
@@ -596,8 +592,7 @@ inline Group* Client::group()
 
 inline bool Client::isShown(bool shaded_is_shown) const
 {
-    return !isMinimized() && (!isShade() || shaded_is_shown) && !hidden &&
-           (!tabGroup() || tabGroup()->current() == this);
+    return !isMinimized() && (!isShade() || shaded_is_shown) && !hidden;
 }
 
 inline bool Client::isHiddenInternal() const
diff --git a/deleted.cpp b/deleted.cpp
index e99dfc6d3..1713efc5f 100644
--- a/deleted.cpp
+++ b/deleted.cpp
@@ -43,7 +43,6 @@ Deleted::Deleted()
     , m_minimized(false)
     , m_modal(false)
     , m_wasClient(false)
-    , m_wasCurrentTab(true)
     , m_decorationRenderer(nullptr)
     , m_fullscreen(false)
     , m_keepAbove(false)
@@ -131,7 +130,6 @@ void Deleted::copyToDeleted(Toplevel* c)
             connect(c, &AbstractClient::windowClosed, this, &Deleted::mainClientClosed);
         }
         m_fullscreen = client->isFullScreen();
-        m_wasCurrentTab = client->isCurrentTab();
         m_keepAbove = client->keepAbove();
         m_keepBelow = client->keepBelow();
         m_caption = client->caption();
diff --git a/deleted.h b/deleted.h
index df10a5c3f..918589a74 100644
--- a/deleted.h
+++ b/deleted.h
@@ -87,9 +87,6 @@ public:
         return m_fullscreen;
     }
 
-    bool isCurrentTab() const {
-        return m_wasCurrentTab;
-    }
     bool keepAbove() const {
         return m_keepAbove;
     }
@@ -220,7 +217,6 @@ private:
     bool m_modal;
     QList<AbstractClient*> m_mainClients;
     bool m_wasClient;
-    bool m_wasCurrentTab;
     Decoration::Renderer *m_decorationRenderer;
     double m_opacity;
     NET::WindowType m_type = NET::Unknown;
diff --git a/doc/windowbehaviour/index.docbook b/doc/windowbehaviour/index.docbook
index 99f93345f..ed94ca8a2 100644
--- a/doc/windowbehaviour/index.docbook
+++ b/doc/windowbehaviour/index.docbook
@@ -42,8 +42,7 @@ you can configure how titlebars and windows react to
 mouse clicks. <guilabel>Moving</guilabel> allows you to configure how
 windows move and place themselves when started.  The
 <guilabel>Advanced</guilabel> options cover some specialized options
-like <quote>window tabbing</quote> and <quote>window
-shading</quote>.
+like <quote>window shading</quote>.
 </para>
 
 <note>
@@ -279,7 +278,7 @@ restores the window to its normal size.
 
 <para>Similar options are available for <guilabel>Wheel event</guilabel>.
 </para>
-<!--FIXME Raise/Lower Shade/Unshade Maximize/Restore Keep Above/Below Move to Previous/Next Desktop Change Opacity  Switch to Window Tab to the Left/Reght -->
+<!--FIXME Raise/Lower Shade/Unshade Maximize/Restore Keep Above/Below Move to Previous/Next Desktop Change Opacity -->
 
 <tip>
 <para>
@@ -340,7 +339,7 @@ are already on top.
 </varlistentry>
 
 <!--FIXME missing:
-Minimize, Shade, Close, Start Window Tab Drag
+Minimize, Shade, Close
 -->
 
 <varlistentry>
@@ -531,7 +530,7 @@ Increase Opacity + Decrease Opacity
 <!--FIXME
 Mouse Wheel has different choices:
 Raise/Lower, Shade/Unshade, Maximize/Restore, Keep Above/Below, 
-Move to Previous/Next Desktop, Change Opacity, Switch to Window Tab to the Left/Right
+Move to Previous/Next Desktop, Change Opacity
 Nothing
 -->
 
@@ -639,19 +638,6 @@ the spinbox to configure the delay un-shading.
 </variablelist>
 
 <variablelist>
-<title>Window Tabbing</title>
-
-<varlistentry>
-<term><guilabel>Automatically group similar windows</guilabel></term>
-<listitem><para>When turned on attempt to automatically detect when a newly opened window is 
-related to an existing one and place them in the same window group.</para></listitem>
-</varlistentry>
-
-<varlistentry>
-<term><guilabel>Switch to automatically grouped windows immediately</guilabel></term>
-<listitem><para>When turned on immediately switch to any new window tabs that were 
-automatically added to the current group.</para></listitem>
-</varlistentry>
 
 <varlistentry>
 <term><guilabel>Placement</guilabel></term>
diff --git a/effects.cpp b/effects.cpp
index a32a1e310..1d3083eb9 100644
--- a/effects.cpp
+++ b/effects.cpp
@@ -561,8 +561,7 @@ void EffectsHandlerImpl::slotClientShown(KWin::Toplevel *t)
     Client *c = static_cast<Client*>(t);
     disconnect(c, &Toplevel::windowShown, this, &EffectsHandlerImpl::slotClientShown);
     setupClientConnections(c);
-    if (!c->tabGroup()) // the "window" has already been there
-        emit windowAdded(c->effectWindow());
+    emit windowAdded(c->effectWindow());
 }
 
 void EffectsHandlerImpl::slotShellClientShown(Toplevel *t)
@@ -1856,7 +1855,6 @@ TOPLEVEL_HELPER(bool, isOutline, isOutline)
 CLIENT_HELPER_WITH_DELETED(bool, isMinimized, isMinimized, false)
 CLIENT_HELPER_WITH_DELETED(bool, isModal, isModal, false)
 CLIENT_HELPER_WITH_DELETED(bool, isFullScreen, isFullScreen, false)
-CLIENT_HELPER_WITH_DELETED(bool, isCurrentTab, isCurrentTab, false)
 CLIENT_HELPER_WITH_DELETED(bool, keepAbove, keepAbove, false)
 CLIENT_HELPER_WITH_DELETED(bool, keepBelow, keepBelow, false)
 CLIENT_HELPER_WITH_DELETED(QString, caption, caption, QString());
@@ -1864,6 +1862,12 @@ CLIENT_HELPER_WITH_DELETED(QVector<uint>, desktops, x11DesktopIds, QVector<uint>
 
 #undef CLIENT_HELPER_WITH_DELETED
 
+// legacy from tab groups, can be removed when no effects use this any more.
+bool EffectWindowImpl::isCurrentTab() const
+{
+    return true;
+}
+
 QString EffectWindowImpl::windowClass() const
 {
     return toplevel->resourceName() + QLatin1Char(' ') + toplevel->resourceClass();
diff --git a/effects/desktopgrid/desktopgrid.cpp b/effects/desktopgrid/desktopgrid.cpp
index b162f22dc..95f6eba59 100644
--- a/effects/desktopgrid/desktopgrid.cpp
+++ b/effects/desktopgrid/desktopgrid.cpp
@@ -1436,10 +1436,6 @@ bool DesktopGridEffect::isRelevantWithPresentWindows(EffectWindow *w) const
         return false;
     }
 
-    if (!w->isCurrentTab()) {
-        return false;
-    }
-
     if (!w->isOnCurrentActivity()) {
         return false;
     }
diff --git a/effects/flipswitch/flipswitch.cpp b/effects/flipswitch/flipswitch.cpp
index b66f04797..15b7446fd 100644
--- a/effects/flipswitch/flipswitch.cpp
+++ b/effects/flipswitch/flipswitch.cpp
@@ -370,8 +370,6 @@ void FlipSwitchEffect::prePaintWindow(EffectWindow* w, WindowPrePaintData& data,
                 w->enablePainting(EffectWindow::PAINT_DISABLED_BY_DESKTOP);
             if (w->isMinimized())
                 w->enablePainting(EffectWindow::PAINT_DISABLED_BY_MINIMIZE);
-            if (!w->isCurrentTab())
-                w->enablePainting(EffectWindow::PAINT_DISABLED_BY_TAB_GROUP);
         } else {
             if ((m_start || m_stop) && !w->isDesktop() && w->isOnCurrentDesktop())
                 data.setTranslucent();
diff --git a/effects/highlightwindow/highlightwindow.cpp b/effects/highlightwindow/highlightwindow.cpp
index cd3ddd4a1..9fa28120c 100644
--- a/effects/highlightwindow/highlightwindow.cpp
+++ b/effects/highlightwindow/highlightwindow.cpp
@@ -51,7 +51,7 @@ HighlightWindowEffect::~HighlightWindowEffect()
 static bool isInitiallyHidden(EffectWindow* w)
 {
     // Is the window initially hidden until it is highlighted?
-    return w->isMinimized() || !w->isCurrentTab() || !w->isOnCurrentDesktop();
+    return w->isMinimized() || !w->isOnCurrentDesktop();
 }
 
 void HighlightWindowEffect::prePaintWindow(EffectWindow* w, WindowPrePaintData& data, int time)
@@ -97,8 +97,6 @@ void HighlightWindowEffect::prePaintWindow(EffectWindow* w, WindowPrePaintData&
     if (opacity != m_windowOpacity.end() && *opacity > 0.01) {
         if (w->isMinimized())
             w->enablePainting(EffectWindow::PAINT_DISABLED_BY_MINIMIZE);
-        if (!w->isCurrentTab())
-            w->enablePainting(EffectWindow::PAINT_DISABLED_BY_TAB_GROUP);
         if (!w->isOnCurrentDesktop())
             w->enablePainting(EffectWindow::PAINT_DISABLED_BY_DESKTOP);
     }
diff --git a/effects/presentwindows/presentwindows.cpp b/effects/presentwindows/presentwindows.cpp
index de58937f5..35a29fdad 100644
--- a/effects/presentwindows/presentwindows.cpp
+++ b/effects/presentwindows/presentwindows.cpp
@@ -289,8 +289,6 @@ void PresentWindowsEffect::prePaintWindow(EffectWindow *w, WindowPrePaintData &d
         }
         w->enablePainting(EffectWindow::PAINT_DISABLED_BY_MINIMIZE);   // Display always
         w->enablePainting(EffectWindow::PAINT_DISABLED_BY_DESKTOP);
-        if (winData->visible)
-            w->enablePainting(EffectWindow::PAINT_DISABLED_BY_TAB_GROUP);
 
         // Calculate window's opacity
         // TODO: Minimized windows or windows not on the current desktop are only 75% visible?
@@ -1620,7 +1618,7 @@ void PresentWindowsEffect::setActive(bool active)
             DataHash::iterator winData = m_windowData.find(w);
             if (winData != m_windowData.end())
                 winData->visible = (w->isOnDesktop(desktop) || w->isOnAllDesktops()) &&
-                                    !w->isMinimized() && (w->isCurrentTab() || winData->visible);
+                                    !w->isMinimized();
         }
         if (m_closeView)
             m_closeView->hide();
@@ -1681,8 +1679,6 @@ bool PresentWindowsEffect::isSelectableWindow(EffectWindow *w)
         return false;
     if (!w->acceptsFocus())
         return false;
-    if (!w->isCurrentTab())
-        return false;
     if (w->isSkipSwitcher())
         return false;
     if (m_closeView && w == effects->findWindow(m_closeView->winId()))
diff --git a/effects/slideback/slideback.cpp b/effects/slideback/slideback.cpp
index 46073645d..67970ecd4 100644
--- a/effects/slideback/slideback.cpp
+++ b/effects/slideback/slideback.cpp
@@ -299,7 +299,7 @@ void SlideBackEffect::slotTabBoxClosed()
 bool SlideBackEffect::isWindowUsable(EffectWindow* w)
 {
     return w && (w->isNormalWindow() || w->isDialog()) && !w->keepAbove() && !w->isDeleted() && !w->isMinimized()
-           && w->isCurrentTab() && w->isPaintingEnabled();
+           && w->isPaintingEnabled();
 }
 
 bool SlideBackEffect::intersects(EffectWindow* windowUnder, const QRect &windowOverGeometry)
diff --git a/geometry.cpp b/geometry.cpp
index 692f8946c..40672e509 100644
--- a/geometry.cpp
+++ b/geometry.cpp
@@ -548,8 +548,6 @@ QPoint Workspace::adjustClientPosition(AbstractClient* c, QPoint pos, bool unres
                     continue; // is minimized
                 if (!(*l)->isShown(false))
                     continue;
-                if ((*l)->tabGroup() && (*l) != (*l)->tabGroup()->current())
-                    continue; // is not active tab
                 if (!((*l)->isOnDesktop(c->desktop()) || c->isOnDesktop((*l)->desktop())))
                     continue; // wrong virtual desktop
                 if (!(*l)->isOnCurrentActivity())
@@ -1360,8 +1358,8 @@ QSize Client::sizeForClientSize(const QSize& wsize, Sizemode mode, bool noframe)
 
     // basesize, minsize, maxsize, paspect and resizeinc have all values defined,
     // even if they're not set in flags - see getWmNormalHints()
-    QSize min_size = tabGroup() ? tabGroup()->minSize() : minSize();
-    QSize max_size = tabGroup() ? tabGroup()->maxSize() : maxSize();
+    QSize min_size = minSize();
+    QSize max_size = maxSize();
     if (isDecorated()) {
         QSize decominsize(0, 0);
         QSize border_size(borderLeft() + borderRight(), borderTop() + borderBottom());
@@ -1531,10 +1529,6 @@ void Client::getWmNormalHints()
         // align to eventual new contraints
         maximize(max_mode);
     }
-    // Update min/max size of this group
-    if (tabGroup())
-        tabGroup()->updateMinMaxSize();
-
     if (isManaged()) {
         // update to match restrictions
         QSize new_size = adjustedSize();
@@ -1913,8 +1907,8 @@ bool Client::isResizable() const
          mode == PositionLeft || mode == PositionBottomLeft) && rules()->checkPosition(invalidPoint) != invalidPoint)
         return false;
 
-    QSize min = tabGroup() ? tabGroup()->minSize() : minSize();
-    QSize max = tabGroup() ? tabGroup()->maxSize() : maxSize();
+    QSize min = minSize();
+    QSize max = maxSize();
     return min.width() < max.width() || min.height() < max.height();
 }
 
@@ -2009,10 +2003,8 @@ void Client::setGeometry(int x, int y, int w, int h, ForceGeometry_t force)
     screens()->setCurrent(this);
     workspace()->updateStackingOrder();
 
-    // need to regenerate decoration pixmaps when either
+    // need to regenerate decoration pixmaps when
     // - size is changed
-    // - maximize mode is changed to MaximizeRestore, when size unchanged
-    //   which can happen when untabbing maximized windows
     if (resized) {
         if (oldClientSize != QSize(w,h))
             discardWindowPixmap();
@@ -2020,11 +2012,6 @@ void Client::setGeometry(int x, int y, int w, int h, ForceGeometry_t force)
     emit geometryShapeChanged(this, geometryBeforeUpdateBlocking());
     addRepaintDuringGeometryUpdates();
     updateGeometryBeforeUpdateBlocking();
-
-    // Update states of all other windows in this group
-    if (tabGroup())
-        tabGroup()->updateStates(this, TabGroup::Geometry);
-
     // TODO: this signal is emitted too often
     emit geometryChanged();
 }
@@ -2082,10 +2069,6 @@ void Client::plainResize(int w, int h, ForceGeometry_t force)
     emit geometryShapeChanged(this, geometryBeforeUpdateBlocking());
     addRepaintDuringGeometryUpdates();
     updateGeometryBeforeUpdateBlocking();
-
-    // Update states of all other windows in this group
-    if (tabGroup())
-        tabGroup()->updateStates(this, TabGroup::Geometry);
     // TODO: this signal is emitted too often
     emit geometryChanged();
 }
@@ -2120,9 +2103,6 @@ void AbstractClient::move(int x, int y, ForceGeometry_t force)
     // client itself is not damaged
     addRepaintDuringGeometryUpdates();
     updateGeometryBeforeUpdateBlocking();
-
-    // Update states of all other windows in this group
-    updateTabGroupStates(TabGroup::Geometry);
     emit geometryChanged();
 }
 
@@ -2172,34 +2152,6 @@ void AbstractClient::setMaximize(bool vertically, bool horizontally)
 
 }
 
-// Update states of all other windows in this group
-class TabSynchronizer
-{
-public:
-    TabSynchronizer(AbstractClient *client, TabGroup::States syncStates) :
-    m_client(client) , m_states(syncStates)
-    {
-        if (client->tabGroup())
-            client->tabGroup()->blockStateUpdates(true);
-    }
-    ~TabSynchronizer()
-    {
-        syncNow();
-    }
-    void syncNow()
-    {
-        if (m_client && m_client->tabGroup()) {
-            m_client->tabGroup()->blockStateUpdates(false);
-            m_client->tabGroup()->updateStates(dynamic_cast<Client*>(m_client), m_states);
-        }
-        m_client = 0;
-    }
-private:
-    AbstractClient *m_client;
-    TabGroup::States m_states;
-};
-
-
 static bool changeMaximizeRecursion = false;
 void Client::changeMaximize(bool horizontal, bool vertical, bool adjust)
 {
@@ -2249,8 +2201,6 @@ void Client::changeMaximize(bool horizontal, bool vertical, bool adjust)
         return;
 
     GeometryUpdatesBlocker blocker(this);
-    // QT synchronizing required because we eventually change from QT to Maximized
-    TabSynchronizer syncer(this, TabGroup::Maximized|TabGroup::QuickTile);
 
     // maximing one way and unmaximizing the other way shouldn't happen,
     // so restore first and then maximize the other way
@@ -2450,8 +2400,6 @@ void Client::changeMaximize(bool horizontal, bool vertical, bool adjust)
         break;
     }
 
-    syncer.syncNow(); // important because of window rule updates!
-
     updateAllowedActions();
     updateWindowRules(Rules::MaximizeVert|Rules::MaximizeHoriz|Rules::Position|Rules::Size);
     emit quickTileModeChanged();
@@ -2487,7 +2435,6 @@ void Client::setFullScreen(bool set, bool user)
 
     if (set) {
         m_fullscreenMode = FullScreenNormal;
-        untab();
         workspace()->raiseClient(this);
     } else {
         m_fullscreenMode = FullScreenNone;
@@ -3244,7 +3191,6 @@ void AbstractClient::setQuickTileMode(QuickTileMode mode, bool keyboard)
     GeometryUpdatesBlocker blocker(this);
 
     if (mode == QuickTileMode(QuickTileFlag::Maximize)) {
-        TabSynchronizer syncer(this, TabGroup::QuickTile|TabGroup::Geometry|TabGroup::Maximized);
         m_quickTileMode = int(QuickTileFlag::None);
         if (maximizeMode() == MaximizeFull) {
             setMaximize(false, false);
@@ -3275,8 +3221,6 @@ void AbstractClient::setQuickTileMode(QuickTileMode mode, bool keyboard)
     // restore from maximized so that it is possible to tile maximized windows with one hit or by dragging
     if (maximizeMode() != MaximizeRestore) {
 
-        TabSynchronizer syncer(this, TabGroup::QuickTile|TabGroup::Geometry|TabGroup::Maximized);
-
         if (mode != QuickTileMode(QuickTileFlag::None)) {
             // decorations may turn off some borders when tiled
             const ForceGeometry_t geom_mode = isDecorated() ? ForceGeometrySet : NormalGeometrySet;
@@ -3298,8 +3242,6 @@ void AbstractClient::setQuickTileMode(QuickTileMode mode, bool keyboard)
     }
 
     if (mode != QuickTileMode(QuickTileFlag::None)) {
-        TabSynchronizer syncer(this, TabGroup::QuickTile|TabGroup::Geometry);
-
         QPoint whichScreen = keyboard ? geometry().center() : Cursor::pos();
 
         // If trying to tile to the side that the window is already tiled to move the window to the next
@@ -3364,8 +3306,6 @@ void AbstractClient::setQuickTileMode(QuickTileMode mode, bool keyboard)
     }
 
     if (mode == QuickTileMode(QuickTileFlag::None)) {
-        TabSynchronizer syncer(this, TabGroup::QuickTile|TabGroup::Geometry);
-
         m_quickTileMode = int(QuickTileFlag::None);
         // Untiling, so just restore geometry, and we're done.
         if (!geometryRestore().isValid()) // invalid if we started maximized and wait for placement
diff --git a/input.cpp b/input.cpp
index 017f01606..627da7b35 100644
--- a/input.cpp
+++ b/input.cpp
@@ -2140,7 +2140,7 @@ Toplevel *InputRedirection::findManagedToplevel(const QPoint &pos)
             continue;
         }
         if (AbstractClient *c = dynamic_cast<AbstractClient*>(t)) {
-            if (!c->isOnCurrentActivity() || !c->isOnCurrentDesktop() || c->isMinimized() || !c->isCurrentTab() || c->isHiddenInternal()) {
+            if (!c->isOnCurrentActivity() || !c->isOnCurrentDesktop() || c->isMinimized() || c->isHiddenInternal()) {
                 continue;
             }
         }
diff --git a/kcmkwin/kwinoptions/actions.ui b/kcmkwin/kwinoptions/actions.ui
index 552048380..9a183320a 100644
--- a/kcmkwin/kwinoptions/actions.ui
+++ b/kcmkwin/kwinoptions/actions.ui
@@ -500,11 +500,6 @@
             <string>Change opacity</string>
            </property>
           </item>
-          <item>
-           <property name="text">
-            <string>Switch to window tab to the left/right</string>
-           </property>
-          </item>
           <item>
            <property name="text">
             <string>Do nothing</string>
diff --git a/kcmkwin/kwinoptions/advanced.ui b/kcmkwin/kwinoptions/advanced.ui
index 539f9830e..200b36d5b 100644
--- a/kcmkwin/kwinoptions/advanced.ui
+++ b/kcmkwin/kwinoptions/advanced.ui
@@ -113,33 +113,6 @@
     </widget>
    </item>
    <item row="2" column="0">
-    <widget class="QLabel" name="windowTabbingLabel">
-     <property name="text">
-      <string>Window tabbing:</string>
-     </property>
-    </widget>
-   </item>
-   <item row="3" column="1">
-    <widget class="QCheckBox" name="autogroupInForeground">
-     <property name="whatsThis">
-      <string>When turned on immediately switch to any new window tabs that were automatically added to the current group.</string>
-     </property>
-     <property name="text">
-      <string>&Switch to automatically grouped windows immediately</string>
-     </property>
-    </widget>
-   </item>
-   <item row="4" column="1">
-    <widget class="QCheckBox" name="inactiveTabsSkipTaskbar">
-     <property name="whatsThis">
-      <string>When turned on hide all tabs that are not active from the taskbar.</string>
-     </property>
-     <property name="text">
-      <string>&Hide inactive window tabs from the taskbar</string>
-     </property>
-    </widget>
-   </item>
-   <item row="5" column="0">
     <widget class="QLabel" name="specialWindowsLabel">
      <property name="text">
       <string>&Special windows:</string>
@@ -149,7 +122,7 @@
      </property>
     </widget>
    </item>
-   <item row="5" column="1">
+   <item row="2" column="1">
     <widget class="QCheckBox" name="hideUtilityWindowsForInactive">
      <property name="whatsThis">
       <string>When turned on, utility windows (tool windows, torn-off menus,...) of inactive applications will be hidden and will be shown only when the application becomes active. Note that applications have to mark the windows with the proper window type for this feature to work.</string>
@@ -159,16 +132,6 @@
      </property>
     </widget>
    </item>
-   <item row="2" column="1">
-    <widget class="QCheckBox" name="autogroupSimilarWindows">
-     <property name="whatsThis">
-      <string>When turned on attempt to automatically detect when a newly opened window is related to an existing one and place them in the same window group.</string>
-     </property>
-     <property name="text">
-      <string>&Group similar windows automatically</string>
-     </property>
-    </widget>
-   </item>
   </layout>
  </widget>
  <customwidgets>
diff --git a/kcmkwin/kwinoptions/mouse.cpp b/kcmkwin/kwinoptions/mouse.cpp
index 8f48c14d7..90ac7faa4 100644
--- a/kcmkwin/kwinoptions/mouse.cpp
+++ b/kcmkwin/kwinoptions/mouse.cpp
@@ -216,7 +216,6 @@ const char* const tbl_TiAc[] = {
     "Shade",
     "Close",
     "Operations menu",
-    "Start window tab drag",
     "Nothing",
     ""
 };
@@ -232,7 +231,6 @@ const char* const tbl_TiInAc[] = {
     "Shade",
     "Close",
     "Operations menu",
-    "Start window tab drag",
     "Nothing",
     ""
 };
@@ -279,7 +277,6 @@ const char* const tbl_TiWAc[] = {
     "Above/Below",
     "Previous/Next Desktop",
     "Change Opacity",
-    "Switch to Window Tab to the Left/Right",
     "Nothing",
     ""
 };
@@ -291,7 +288,6 @@ const char* const tbl_AllW[] = {
     "Above/Below",
     "Previous/Next Desktop",
     "Change Opacity",
-    "Switch to Window Tab to the Left/Right",
     "Nothing",
     ""
 };
@@ -393,11 +389,11 @@ void KTitleBarActionsConfig::load()
 
     KConfigGroup cg(config, "MouseBindings");
     setComboText(m_ui->coTiAct1, cg.readEntry("CommandActiveTitlebar1", "Raise").toLatin1());
-    setComboText(m_ui->coTiAct2, cg.readEntry("CommandActiveTitlebar2", "Start Window Tab Drag").toLatin1());
+    setComboText(m_ui->coTiAct2, cg.readEntry("CommandActiveTitlebar2", "Nothing").toLatin1());
     setComboText(m_ui->coTiAct3, cg.readEntry("CommandActiveTitlebar3", "Operations menu").toLatin1());
-    setComboText(m_ui->coTiAct4, cg.readEntry("CommandTitlebarWheel", "Switch to Window Tab to the Left/Right").toLatin1());
+    setComboText(m_ui->coTiAct4, cg.readEntry("CommandTitlebarWheel", "Nothing").toLatin1());
     setComboText(m_ui->coTiInAct1, cg.readEntry("CommandInactiveTitlebar1", "Activate and raise").toLatin1());
-    setComboText(m_ui->coTiInAct2, cg.readEntry("CommandInactiveTitlebar2", "Start Window Tab Drag").toLatin1());
+    setComboText(m_ui->coTiInAct2, cg.readEntry("CommandInactiveTitlebar2", "Nothing").toLatin1());
     setComboText(m_ui->coTiInAct3, cg.readEntry("CommandInactiveTitlebar3", "Operations menu").toLatin1());
 }
 
@@ -432,11 +428,11 @@ void KTitleBarActionsConfig::defaults()
 {
     setComboText(m_ui->coTiDbl, "Maximize");
     setComboText(m_ui->coTiAct1, "Raise");
-    setComboText(m_ui->coTiAct2, "Start Window Tab Drag");
+    setComboText(m_ui->coTiAct2, "Nothing");
     setComboText(m_ui->coTiAct3, "Operations menu");
-    setComboText(m_ui->coTiAct4, "Switch to Window Tab to the Left/Right");
+    setComboText(m_ui->coTiAct4, "Nothing");
     setComboText(m_ui->coTiInAct1, "Activate and raise");
-    setComboText(m_ui->coTiInAct2, "Start Window Tab Drag");
+    setComboText(m_ui->coTiInAct2, "Nothing");
     setComboText(m_ui->coTiInAct3, "Operations menu");
     setComboText(m_ui->leftClickMaximizeButton, tbl_Max[0]);
     setComboText(m_ui->middleClickMaximizeButton, tbl_Max[1]);
diff --git a/kcmkwin/kwinoptions/mouse.ui b/kcmkwin/kwinoptions/mouse.ui
index 7348b9182..4de09409b 100644
--- a/kcmkwin/kwinoptions/mouse.ui
+++ b/kcmkwin/kwinoptions/mouse.ui
@@ -127,11 +127,6 @@
           <string>Change opacity</string>
          </property>
         </item>
-        <item>
-         <property name="text">
-          <string>Switch to window tab to the left/right</string>
-         </property>
-        </item>
         <item>
          <property name="text">
           <string>Do nothing</string>
@@ -271,11 +266,6 @@
             <string>Show actions menu</string>
            </property>
           </item>
-          <item>
-           <property name="text">
-            <string>Start window tab drag</string>
-           </property>
-          </item>
           <item>
            <property name="text">
             <string>Do nothing</string>
@@ -338,11 +328,6 @@
             <string>Show actions menu</string>
            </property>
           </item>
-          <item>
-           <property name="text">
-            <string>Start window tab drag</string>
-           </property>
-          </item>
           <item>
            <property name="text">
             <string>Do nothing</string>
@@ -396,11 +381,6 @@
             <string>Show actions menu</string>
            </property>
           </item>
-          <item>
-           <property name="text">
-            <string>Start window tab drag</string>
-           </property>
-          </item>
           <item>
            <property name="text">
             <string>Do nothing</string>
@@ -463,11 +443,6 @@
             <string>Show actions menu</string>
            </property>
           </item>
-          <item>
-           <property name="text">
-            <string>Start window tab drag</string>
-           </property>
-          </item>
           <item>
            <property name="text">
             <string>Do nothing</string>
@@ -521,11 +496,6 @@
             <string>Show actions menu</string>
            </property>
           </item>
-          <item>
-           <property name="text">
-            <string>Start window tab drag</string>
-           </property>
-          </item>
           <item>
            <property name="text">
             <string>Do nothing</string>
@@ -588,11 +558,6 @@
             <string>Show actions menu</string>
            </property>
           </item>
-          <item>
-           <property name="text">
-            <string>Start window tab drag</string>
-           </property>
-          </item>
           <item>
            <property name="text">
             <string>Do nothing</string>
diff --git a/kcmkwin/kwinoptions/windows.cpp b/kcmkwin/kwinoptions/windows.cpp
index 1fe6a88da..559b9d796 100644
--- a/kcmkwin/kwinoptions/windows.cpp
+++ b/kcmkwin/kwinoptions/windows.cpp
@@ -53,8 +53,6 @@
 #define KWIN_FOCUS_STEALING        "FocusStealingPreventionLevel"
 #define KWIN_HIDE_UTILITY          "HideUtilityWindowsForInactive"
 #define KWIN_INACTIVE_SKIP_TASKBAR "InactiveTabsSkipTaskbar"
-#define KWIN_AUTOGROUP_SIMILAR     "AutogroupSimilarWindows"
-#define KWIN_AUTOGROUP_FOREGROUND  "AutogroupInForeground"
 #define KWIN_SEPARATE_SCREEN_FOCUS "SeparateScreenFocus"
 #define KWIN_ACTIVE_MOUSE_SCREEN   "ActiveMouseScreen"
 
@@ -389,14 +387,10 @@ KAdvancedConfig::KAdvancedConfig(bool _standAlone, KConfig *_config, QWidget *pa
     m_ui->placementCombo->setItemData(6, "UnderMouse");
 
     connect(m_ui->shadeHoverOn, SIGNAL(toggled(bool)), this, SLOT(shadeHoverChanged(bool)));
-    connect(m_ui->inactiveTabsSkipTaskbar, SIGNAL(toggled(bool)), SLOT(changed()));
-    connect(m_ui->autogroupSimilarWindows, SIGNAL(toggled(bool)), SLOT(changed()));
-    connect(m_ui->autogroupInForeground, SIGNAL(toggled(bool)), SLOT(changed()));
     connect(m_ui->shadeHoverOn, SIGNAL(toggled(bool)), SLOT(changed()));
     connect(m_ui->shadeHover, SIGNAL(valueChanged(int)), SLOT(changed()));
     connect(m_ui->placementCombo, SIGNAL(activated(int)), SLOT(changed()));
     connect(m_ui->hideUtilityWindowsForInactive, SIGNAL(toggled(bool)), SLOT(changed()));
-    m_ui->inactiveTabsSkipTaskbar->setVisible(false);   // TODO: We want translations in case this is fixed...
     load();
 
 }
@@ -447,9 +441,6 @@ void KAdvancedConfig::load(void)
     m_ui->placementCombo->setCurrentIndex(idx);
 
     setHideUtilityWindowsForInactive(cg.readEntry(KWIN_HIDE_UTILITY, true));
-    setInactiveTabsSkipTaskbar(cg.readEntry(KWIN_INACTIVE_SKIP_TASKBAR, false));
-    setAutogroupSimilarWindows(cg.readEntry(KWIN_AUTOGROUP_SIMILAR, false));
-    setAutogroupInForeground(cg.readEntry(KWIN_AUTOGROUP_FOREGROUND, true));
 
     emit KCModule::changed(false);
 }
@@ -464,13 +455,8 @@ void KAdvancedConfig::save(void)
     v = getShadeHoverInterval();
     if (v < 0) v = 0;
     cg.writeEntry(KWIN_SHADEHOVER_INTERVAL, v);
-
     cg.writeEntry(KWIN_PLACEMENT, m_ui->placementCombo->itemData(m_ui->placementCombo->currentIndex()).toString());
-
     cg.writeEntry(KWIN_HIDE_UTILITY, m_ui->hideUtilityWindowsForInactive->isChecked());
-    cg.writeEntry(KWIN_INACTIVE_SKIP_TASKBAR, m_ui->inactiveTabsSkipTaskbar->isChecked());
-    cg.writeEntry(KWIN_AUTOGROUP_SIMILAR, m_ui->autogroupSimilarWindows->isChecked());
-    cg.writeEntry(KWIN_AUTOGROUP_FOREGROUND, m_ui->autogroupInForeground->isChecked());
 
     if (standAlone) {
         config->sync();
@@ -489,9 +475,6 @@ void KAdvancedConfig::defaults()
     setShadeHoverInterval(250);
     m_ui->placementCombo->setCurrentIndex(0); // default to Smart
     setHideUtilityWindowsForInactive(true);
-    setInactiveTabsSkipTaskbar(false);
-    setAutogroupSimilarWindows(false);
-    setAutogroupInForeground(true);
     emit KCModule::changed(true);
 }
 
@@ -501,21 +484,6 @@ void KAdvancedConfig::setHideUtilityWindowsForInactive(bool s)
     m_ui->hideUtilityWindowsForInactive->setChecked(s);
 }
 
-void KAdvancedConfig::setInactiveTabsSkipTaskbar(bool s)
-{
-    m_ui->inactiveTabsSkipTaskbar->setChecked(s);
-}
-
-void KAdvancedConfig::setAutogroupSimilarWindows(bool s)
-{
-    m_ui->autogroupSimilarWindows->setChecked(s);
-}
-
-void KAdvancedConfig::setAutogroupInForeground(bool s)
-{
-    m_ui->autogroupInForeground->setChecked(s);
-}
-
 KWinMovingConfigForm::KWinMovingConfigForm(QWidget* parent)
     : QWidget(parent)
 {
diff --git a/kcmkwin/kwinoptions/windows.h b/kcmkwin/kwinoptions/windows.h
index 0de3a215d..5e917beb2 100644
--- a/kcmkwin/kwinoptions/windows.h
+++ b/kcmkwin/kwinoptions/windows.h
@@ -183,9 +183,6 @@ private:
     KWinAdvancedConfigForm *m_ui;
 
     void setHideUtilityWindowsForInactive(bool);
-    void setInactiveTabsSkipTaskbar(bool);
-    void setAutogroupSimilarWindows(bool);
-    void setAutogroupInForeground(bool);
 };
 
 #endif // KKWMWINDOWS_H
diff --git a/kwin.kcfg b/kwin.kcfg
index 2203dbfa7..453e2b6e9 100644
--- a/kwin.kcfg
+++ b/kwin.kcfg
@@ -6,7 +6,7 @@
     <kcfgfile arg="true" />
     <group name="MouseBindings">
         <entry name="CommandTitlebarWheel" type="String">
-            <default>Switch to Window Tab to the Left/Right</default>
+            <default>Nothing</default>
         </entry>
         <entry name="CommandAllKey" type="String">
             <default>Alt</default>
@@ -18,7 +18,7 @@
             <default>Raise</default>
         </entry>
         <entry name="CommandActiveTitlebar2" type="String">
-            <default>Start Window Tab Drag</default>
+            <default>Nothing</default>
         </entry>
         <entry name="CommandActiveTitlebar3" type="String">
             <default>Operations menu</default>
@@ -27,7 +27,7 @@
             <default>Activate and raise</default>
         </entry>
         <entry name="CommandInactiveTitlebar2" type="String">
-            <default>Start Window Tab Drag</default>
+            <default>Nothing</default>
         </entry>
         <entry name="CommandInactiveTitlebar3" type="String">
             <default>Operations menu</default>
diff --git a/kwinbindings.cpp b/kwinbindings.cpp
index f72941dc4..b628c4d7e 100644
--- a/kwinbindings.cpp
+++ b/kwinbindings.cpp
@@ -46,10 +46,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
     initShortcut(QStringLiteral(name), i18n(name), key, target, &fnSlot);
 
 
-DEF(I18N_NOOP("Walk Through Window Tabs"),             0, slotActivateNextTab);
-DEF(I18N_NOOP("Walk Through Window Tabs (Reverse)"),   0, slotActivatePrevTab);
-DEF(I18N_NOOP("Remove Window From Group"),             0, slotUntab);
-
 DEF(I18N_NOOP("Window Operations Menu"),
     Qt::ALT + Qt::Key_F3, slotWindowOperations);
 DEF2("Window Close", I18N_NOOP("Close Window"),
diff --git a/layers.cpp b/layers.cpp
index 2bc33f296..fb41bfe9a 100644
--- a/layers.cpp
+++ b/layers.cpp
@@ -853,16 +853,10 @@ void Client::restackWindow(xcb_window_t above, int detail, NET::RequestSource sr
 
 void Client::doSetKeepAbove()
 {
-    // Update states of all other windows in this group
-    if (tabGroup())
-        tabGroup()->updateStates(this, TabGroup::Layer);
 }
 
 void Client::doSetKeepBelow()
 {
-    // Update states of all other windows in this group
-    if (tabGroup())
-        tabGroup()->updateStates(this, TabGroup::Layer);
 }
 
 bool Client::belongsToDesktop() const
diff --git a/libkwineffects/kwineffects.h b/libkwineffects/kwineffects.h
index 173df5082..c57c1bddf 100644
--- a/libkwineffects/kwineffects.h
+++ b/libkwineffects/kwineffects.h
@@ -2097,7 +2097,7 @@ public:
         PAINT_DISABLED_BY_DESKTOP      = 1 << 2,
         /**  Window will not be painted because it is minimized  */
         PAINT_DISABLED_BY_MINIMIZE     = 1 << 3,
-        /**  Window will not be painted because it is not the active window in a client group  */
+        /**  Deprecated, tab groups have been removed: Window will not be painted because it is not the active window in a client group */
         PAINT_DISABLED_BY_TAB_GROUP = 1 << 4,
         /**  Window will not be painted because it's not on the current activity  */
         PAINT_DISABLED_BY_ACTIVITY     = 1 << 5
@@ -2332,6 +2332,7 @@ public:
     virtual void unminimize() = 0;
     Q_SCRIPTABLE virtual void closeWindow() = 0;
 
+    /// deprecated
     virtual bool isCurrentTab() const = 0;
 
     /**
diff --git a/manage.cpp b/manage.cpp
index 6ea7d141b..78e12328b 100644
--- a/manage.cpp
+++ b/manage.cpp
@@ -340,51 +340,6 @@ bool Client::manage(xcb_window_t w, bool isMapped)
 
     // Create client group if the window will have a decoration
     bool dontKeepInArea = false;
-    setTabGroup(NULL);
-    if (!noBorder() && false) {
-        const bool autogrouping = rules()->checkAutogrouping(options->isAutogroupSimilarWindows());
-        const bool autogroupInFg = rules()->checkAutogroupInForeground(options->isAutogroupInForeground());
-        // Automatically add to previous groups on session restore
-        if (session && session->tabGroupClient && !workspace()->hasClient(session->tabGroupClient))
-            session->tabGroupClient = NULL;
-        if (session && session->tabGroupClient && session->tabGroupClient != this) {
-            tabBehind(session->tabGroupClient, autogroupInFg);
-        } else if (isMapped && autogrouping) {
-            // If the window is already mapped (Restarted KWin) add any windows that already have the
-            // same geometry to the same client group. (May incorrectly handle maximized windows)
-            foreach (Client *other, workspace()->clientList()) {
-                if (other->maximizeMode() != MaximizeFull &&
-                    geom == QRect(other->pos(), other->clientSize()) &&
-                    desk == other->desktop() && activities() == other->activities()) {
-
-                    tabBehind(other, autogroupInFg);
-                    break;
-
-                }
-            }
-        }
-        if (!(tabGroup() || isMapped || session)) {
-            // Attempt to automatically group similar windows
-            Client* similar = findAutogroupCandidate();
-            if (similar && !similar->noBorder()) {
-                if (autogroupInFg) {
-                    similar->setDesktop(desk); // can happen when grouping by id. ...
-                    similar->setMinimized(false); // ... or anyway - still group, but "here" and visible
-                }
-                if (!similar->isMinimized()) { // do not attempt to tab in background of a hidden group
-                    geom = QRect(similar->pos() + similar->clientPos(), similar->clientSize());
-                    updateDecoration(false);
-                    if (tabBehind(similar, autogroupInFg)) {
-                        // Don't move entire group
-                        geom = QRect(similar->pos() + similar->clientPos(), similar->clientSize());
-                        placementDone = true;
-                        dontKeepInArea = true;
-                    }
-                }
-            }
-        }
-    }
-
     readColorScheme(colorSchemeCookie);
 
     readApplicationMenuServiceName(applicationMenuServiceNameCookie);
@@ -734,63 +689,4 @@ void Client::embedClient(xcb_window_t w, xcb_visualid_t visualid, xcb_colormap_t
     updateMouseGrab();
 }
 
-// To accept "mainwindow#1" to "mainwindow#2"
-static QByteArray truncatedWindowRole(QByteArray a)
-{
-    int i = a.indexOf('#');
-    if (i == -1)
-        return a;
-    QByteArray b(a);
-    b.truncate(i);
-    return b;
-}
-
-Client* Client::findAutogroupCandidate() const
-{
-    // Attempt to find a similar window to the input. If we find multiple possibilities that are in
-    // different groups then ignore all of them. This function is for automatic window grouping.
-    Client *found = NULL;
-
-    // See if the window has a group ID to match with
-    QString wGId = rules()->checkAutogroupById(QString());
-    if (!wGId.isEmpty()) {
-        foreach (Client *c, workspace()->clientList()) {
-            if (activities() != c->activities())
-                continue; // don't cross activities
-            if (wGId == c->rules()->checkAutogroupById(QString())) {
-                if (found && found->tabGroup() != c->tabGroup()) { // We've found two, ignore both
-                    found = NULL;
-                    break; // Continue to the next test
-                }
-                found = c;
-            }
-        }
-        if (found)
-            return found;
-    }
-
-    // If this is a transient window don't take a guess
-    if (isTransient())
-        return NULL;
-
-    // If we don't have an ID take a guess
-    if (rules()->checkAutogrouping(options->isAutogroupSimilarWindows())) {
-        QByteArray wRole = truncatedWindowRole(windowRole());
-        foreach (Client *c, workspace()->clientList()) {
-            if (desktop() != c->desktop() || activities() != c->activities())
-                continue;
-            QByteArray wRoleB = truncatedWindowRole(c->windowRole());
-            if (resourceClass() == c->resourceClass() &&  // Same resource class
-                    wRole == wRoleB && // Same window role
-                    c->isNormalWindow()) { // Normal window TODO: Can modal windows be "normal"?
-                if (found && found->tabGroup() != c->tabGroup())   // We've found two, ignore both
-                    return NULL;
-                found = c;
-            }
-        }
-    }
-
-    return found;
-}
-
 } // namespace
diff --git a/options.cpp b/options.cpp
index 7af5093b3..842715627 100644
--- a/options.cpp
+++ b/options.cpp
@@ -106,9 +106,6 @@ Options::Options(QObject *parent)
     , m_focusStealingPreventionLevel(0)
     , m_killPingTimeout(0)
     , m_hideUtilityWindowsForInactive(false)
-    , m_inactiveTabsSkipTaskbar(false)
-    , m_autogroupSimilarWindows(false)
-    , m_autogroupInForeground(false)
     , m_compositingMode(Options::defaultCompositingMode())
     , m_useCompositing(Options::defaultUseCompositing())
     , m_hiddenPreviews(Options::defaultHiddenPreviews())
@@ -559,33 +556,6 @@ void Options::setHideUtilityWindowsForInactive(bool hideUtilityWindowsForInactiv
     emit hideUtilityWindowsForInactiveChanged();
 }
 
-void Options::setInactiveTabsSkipTaskbar(bool inactiveTabsSkipTaskbar)
-{
-    if (m_inactiveTabsSkipTaskbar == inactiveTabsSkipTaskbar) {
-        return;
-    }
-    m_inactiveTabsSkipTaskbar = inactiveTabsSkipTaskbar;
-    emit inactiveTabsSkipTaskbarChanged();
-}
-
-void Options::setAutogroupSimilarWindows(bool autogroupSimilarWindows)
-{
-    if (m_autogroupSimilarWindows == autogroupSimilarWindows) {
-        return;
-    }
-    m_autogroupSimilarWindows = autogroupSimilarWindows;
-    emit autogroupSimilarWindowsChanged();
-}
-
-void Options::setAutogroupInForeground(bool autogroupInForeground)
-{
-    if (m_autogroupInForeground == autogroupInForeground) {
-        return;
-    }
-    m_autogroupInForeground = autogroupInForeground;
-    emit autogroupInForegroundChanged();
-}
-
 void Options::setCompositingMode(int compositingMode)
 {
     if (m_compositingMode == static_cast<CompositingType>(compositingMode)) {
@@ -788,14 +758,14 @@ void Options::loadConfig()
     // Mouse bindings
     config = KConfigGroup(m_settings->config(), "MouseBindings");
     // TODO: add properties for missing options
-    CmdTitlebarWheel = mouseWheelCommand(config.readEntry("CommandTitlebarWheel", "Switch to Window Tab to the Left/Right"));
+    CmdTitlebarWheel = mouseWheelCommand(config.readEntry("CommandTitlebarWheel", "Nothing"));
     CmdAllModKey = (config.readEntry("CommandAllKey", "Alt") == QStringLiteral("Meta")) ? Qt::Key_Meta : Qt::Key_Alt;
     CmdAllWheel = mouseWheelCommand(config.readEntry("CommandAllWheel", "Nothing"));
     setCommandActiveTitlebar1(mouseCommand(config.readEntry("CommandActiveTitlebar1", "Raise"), true));
-    setCommandActiveTitlebar2(mouseCommand(config.readEntry("CommandActiveTitlebar2", "Start Window Tab Drag"), true));
+    setCommandActiveTitlebar2(mouseCommand(config.readEntry("CommandActiveTitlebar2", "Nothing"), true));
     setCommandActiveTitlebar3(mouseCommand(config.readEntry("CommandActiveTitlebar3", "Operations menu"), true));
     setCommandInactiveTitlebar1(mouseCommand(config.readEntry("CommandInactiveTitlebar1", "Activate and raise"), true));
-    setCommandInactiveTitlebar2(mouseCommand(config.readEntry("CommandInactiveTitlebar2", "Start Window Tab Drag"), true));
+    setCommandInactiveTitlebar2(mouseCommand(config.readEntry("CommandInactiveTitlebar2", "Nothing"), true));
     setCommandInactiveTitlebar3(mouseCommand(config.readEntry("CommandInactiveTitlebar3", "Operations menu"), true));
     setCommandWindow1(mouseCommand(config.readEntry("CommandWindow1", "Activate, raise and pass click"), false));
     setCommandWindow2(mouseCommand(config.readEntry("CommandWindow2", "Activate and pass click"), false));
@@ -857,9 +827,6 @@ void Options::syncFromKcfgc()
     setSnapOnlyWhenOverlapping(m_settings->snapOnlyWhenOverlapping());
     setKillPingTimeout(m_settings->killPingTimeout());
     setHideUtilityWindowsForInactive(m_settings->hideUtilityWindowsForInactive());
-    setInactiveTabsSkipTaskbar(m_settings->inactiveTabsSkipTaskbar());
-    setAutogroupSimilarWindows(m_settings->autogroupSimilarWindows());
-    setAutogroupInForeground(m_settings->autogroupInForeground());
     setBorderlessMaximizedWindows(m_settings->borderlessMaximizedWindows());
     setElectricBorderMaximize(m_settings->electricBorderMaximize());
     setElectricBorderTiling(m_settings->electricBorderTiling());
@@ -1042,7 +1009,6 @@ Options::MouseCommand Options::mouseCommand(const QString &name, bool restricted
     if (lowerName == QStringLiteral("resize")) return restricted ? MouseResize : MouseUnrestrictedResize;
     if (lowerName == QStringLiteral("shade")) return MouseShade;
     if (lowerName == QStringLiteral("minimize")) return MouseMinimize;
-    if (lowerName == QStringLiteral("start window tab drag")) return MouseDragTab;
     if (lowerName == QStringLiteral("close")) return MouseClose;
     if (lowerName == QStringLiteral("increase opacity")) return MouseOpacityMore;
     if (lowerName == QStringLiteral("decrease opacity")) return MouseOpacityLess;
@@ -1059,9 +1025,8 @@ Options::MouseWheelCommand Options::mouseWheelCommand(const QString &name)
     if (lowerName == QStringLiteral("above/below")) return MouseWheelAboveBelow;
     if (lowerName == QStringLiteral("previous/next desktop")) return MouseWheelPreviousNextDesktop;
     if (lowerName == QStringLiteral("change opacity")) return MouseWheelChangeOpacity;
-    if (lowerName == QStringLiteral("switch to window tab to the left/right")) return MouseWheelChangeCurrentTab;
     if (lowerName == QStringLiteral("nothing")) return MouseWheelNothing;
-    return MouseWheelChangeCurrentTab;
+    return MouseWheelNothing;
 }
 
 bool Options::showGeometryTip() const
@@ -1089,8 +1054,6 @@ Options::MouseCommand Options::wheelToMouseCommand(MouseWheelCommand com, int de
         return delta > 0 ? MousePreviousDesktop : MouseNextDesktop;
     case MouseWheelChangeOpacity:
         return delta > 0 ? MouseOpacityMore : MouseOpacityLess;
-    case MouseWheelChangeCurrentTab:
-        return delta > 0 ? MousePreviousTab : MouseNextTab;
     default:
         return MouseNothing;
     }
diff --git a/options.h b/options.h
index 63845e201..7f0996eed 100644
--- a/options.h
+++ b/options.h
@@ -158,9 +158,6 @@ class KWIN_EXPORT Options : public QObject
      * Whether to hide utility windows for inactive applications.
      */
     Q_PROPERTY(bool hideUtilityWindowsForInactive READ isHideUtilityWindowsForInactive WRITE setHideUtilityWindowsForInactive NOTIFY hideUtilityWindowsForInactiveChanged)
-    Q_PROPERTY(bool inactiveTabsSkipTaskbar READ isInactiveTabsSkipTaskbar WRITE setInactiveTabsSkipTaskbar NOTIFY inactiveTabsSkipTaskbarChanged)
-    Q_PROPERTY(bool autogroupSimilarWindows READ isAutogroupSimilarWindows WRITE setAutogroupSimilarWindows NOTIFY autogroupSimilarWindowsChanged)
-    Q_PROPERTY(bool autogroupInForeground READ isAutogroupInForeground WRITE setAutogroupInForeground NOTIFY autogroupInForegroundChanged)
     Q_PROPERTY(int compositingMode READ compositingMode WRITE setCompositingMode NOTIFY compositingModeChanged)
     Q_PROPERTY(bool useCompositing READ isUseCompositing WRITE setUseCompositing NOTIFY useCompositingChanged)
     Q_PROPERTY(int hiddenPreviews READ hiddenPreviews WRITE setHiddenPreviews NOTIFY hiddenPreviewsChanged)
@@ -362,11 +359,6 @@ public:
         NoOp,
         SetupWindowShortcutOp,
         ApplicationRulesOp,
-        RemoveTabFromGroupOp, // Remove from group
-        CloseTabGroupOp, // Close the group
-        ActivateNextTabOp, // Move left in the group
-        ActivatePreviousTabOp, // Move right in the group
-        TabDragOp,
     };
 
     WindowOperation operationTitlebarDblClick() const {
@@ -396,14 +388,14 @@ public:
         MouseNextDesktop, MousePreviousDesktop,
         MouseAbove, MouseBelow,
         MouseOpacityMore, MouseOpacityLess,
-        MouseClose, MousePreviousTab, MouseNextTab, MouseDragTab,
+        MouseClose,
         MouseNothing
     };
 
     enum MouseWheelCommand {
         MouseWheelRaiseLower, MouseWheelShadeUnshade, MouseWheelMaximizeRestore,
         MouseWheelAboveBelow, MouseWheelPreviousNextDesktop,
-        MouseWheelChangeOpacity, MouseWheelChangeCurrentTab,
+        MouseWheelChangeOpacity,
         MouseWheelNothing
     };
 
@@ -520,16 +512,6 @@ public:
         return m_hideUtilityWindowsForInactive;
     }
 
-    bool isInactiveTabsSkipTaskbar() const {
-        return m_inactiveTabsSkipTaskbar;
-    }
-    bool isAutogroupSimilarWindows() const {
-        return m_autogroupSimilarWindows;
-    }
-    bool isAutogroupInForeground() const {
-        return m_autogroupInForeground;
-    }
-
     /**
      * Returns the animation time factor for desktop effects.
      */
@@ -641,9 +623,6 @@ public:
     void setBorderlessMaximizedWindows(bool borderlessMaximizedWindows);
     void setKillPingTimeout(int killPingTimeout);
     void setHideUtilityWindowsForInactive(bool hideUtilityWindowsForInactive);
-    void setInactiveTabsSkipTaskbar(bool inactiveTabsSkipTaskbar);
-    void setAutogroupSimilarWindows(bool autogroupSimilarWindows);
-    void setAutogroupInForeground(bool autogroupInForeground);
     void setCompositingMode(int compositingMode);
     void setUseCompositing(bool useCompositing);
     void setHiddenPreviews(int hiddenPreviews);
@@ -676,7 +655,7 @@ public:
         return MouseRaise;
     }
     static MouseCommand defaultCommandActiveTitlebar2() {
-        return MouseDragTab;
+        return MouseNothing;
     }
     static MouseCommand defaultCommandActiveTitlebar3() {
         return MouseOperationsMenu;
@@ -685,7 +664,7 @@ public:
         return MouseActivateAndRaise;
     }
     static MouseCommand defaultCommandInactiveTitlebar2() {
-        return MouseDragTab;
+        return MouseNothing;
     }
     static MouseCommand defaultCommandInactiveTitlebar3() {
         return MouseOperationsMenu;
@@ -712,7 +691,7 @@ public:
         return MouseUnrestrictedResize;
     }
     static MouseWheelCommand defaultCommandTitlebarWheel() {
-        return MouseWheelChangeCurrentTab;
+        return MouseWheelNothing;
     }
     static MouseWheelCommand defaultCommandAllWheel() {
         return MouseWheelNothing;
@@ -720,9 +699,6 @@ public:
     static uint defaultKeyCmdAllModKey() {
         return Qt::Key_Alt;
     }
-    static bool defaultAutogroupInForeground() {
-        return true;
-    }
     static CompositingType defaultCompositingMode() {
         return OpenGLCompositing;
     }
@@ -827,9 +803,6 @@ Q_SIGNALS:
     void borderlessMaximizedWindowsChanged();
     void killPingTimeoutChanged();
     void hideUtilityWindowsForInactiveChanged();
-    void inactiveTabsSkipTaskbarChanged();
-    void autogroupSimilarWindowsChanged();
-    void autogroupInForegroundChanged();
     void compositingModeChanged();
     void useCompositingChanged();
     void hiddenPreviewsChanged();
@@ -869,9 +842,6 @@ private:
     int m_focusStealingPreventionLevel;
     int m_killPingTimeout;
     bool m_hideUtilityWindowsForInactive;
-    bool m_inactiveTabsSkipTaskbar;
-    bool m_autogroupSimilarWindows;
-    bool m_autogroupInForeground;
 
     CompositingType m_compositingMode;
     bool m_useCompositing;
diff --git a/placement.cpp b/placement.cpp
index 406fb85ee..aba2372c1 100644
--- a/placement.cpp
+++ b/placement.cpp
@@ -176,8 +176,6 @@ static inline bool isIrrelevant(const AbstractClient *client, const AbstractClie
         return true;
     if (client == regarding)
         return true;
-    if (!client->isCurrentTab())
-        return true;
     if (!client->isShown(false))
         return true;
     if (!client->isOnDesktop(desktop))
diff --git a/scene.cpp b/scene.cpp
index e38a3c783..55c0a2d14 100644
--- a/scene.cpp
+++ b/scene.cpp
@@ -823,8 +823,6 @@ void Scene::Window::resetPaintingEnabled()
     if (AbstractClient *c = dynamic_cast<AbstractClient*>(toplevel)) {
         if (c->isMinimized())
             disable_painting |= PAINT_DISABLED_BY_MINIMIZE;
-        if (c->tabGroup() && c != c->tabGroup()->current())
-            disable_painting |= PAINT_DISABLED_BY_TAB_GROUP;
         if (c->isHiddenInternal()) {
             disable_painting |= PAINT_DISABLED;
         }
diff --git a/scene.h b/scene.h
index 3f4cb6c8c..4b128f7fb 100644
--- a/scene.h
+++ b/scene.h
@@ -319,8 +319,6 @@ public:
         PAINT_DISABLED_BY_DESKTOP      = 1 << 2,
         // Window will not be painted because it is minimized
         PAINT_DISABLED_BY_MINIMIZE     = 1 << 3,
-        // Window will not be painted because it is not the active window in a client group
-        PAINT_DISABLED_BY_TAB_GROUP = 1 << 4,
         // Window will not be painted because it's not on the current activity
         PAINT_DISABLED_BY_ACTIVITY     = 1 << 5
     };
diff --git a/scripting/scripting_model.cpp b/scripting/scripting_model.cpp
index 562e80eb4..911aeda78 100644
--- a/scripting/scripting_model.cpp
+++ b/scripting/scripting_model.cpp
@@ -142,11 +142,6 @@ bool ClientLevel::exclude(AbstractClient *client) const
             return true;
         }
     }
-    if (exclusions & ClientModel::NonSelectedWindowTabExclusion) {
-        if (!client->isCurrentTab()) {
-            return true;
-        }
-    }
     if (exclusions & ClientModel::NotAcceptingFocusExclusion) {
         if (!client->wantsInput()) {
             return true;
diff --git a/shell_client.cpp b/shell_client.cpp
index 391430e1c..eab97ba74 100644
--- a/shell_client.cpp
+++ b/shell_client.cpp
@@ -1028,7 +1028,6 @@ void ShellClient::setFullScreen(bool set, bool user)
     m_fullScreen = set;
 
     if (set) {
-        untab();
         workspace()->raiseClient(this);
     }
     RequestGeometryBlocker requestBlocker(this);
@@ -1111,10 +1110,10 @@ bool ShellClient::userCanSetFullScreen() const
 bool ShellClient::userCanSetNoBorder() const
 {
     if (m_serverDecoration && m_serverDecoration->mode() == ServerSideDecorationManagerInterface::Mode::Server) {
-        return !isFullScreen() && !isShade() && !tabGroup();
+        return !isFullScreen() && !isShade();
     }
     if (m_xdgDecoration && m_xdgDecoration->requestedMode() != XdgDecorationInterface::Mode::ClientSide) {
-        return !isFullScreen() && !isShade() && !tabGroup();
+        return !isFullScreen() && !isShade();
     }
     return false;
 }
diff --git a/sm.cpp b/sm.cpp
index d6ef44213..192ff3311 100644
--- a/sm.cpp
+++ b/sm.cpp
@@ -201,8 +201,6 @@ void Workspace::storeClient(KConfigGroup &cg, int num, Client *c)
     cg.writeEntry(QLatin1String("windowType") + n, windowTypeToTxt(c->windowType()));
     cg.writeEntry(QLatin1String("shortcut") + n, c->shortcut().toString());
     cg.writeEntry(QLatin1String("stackingOrder") + n, unconstrained_stacking_order.indexOf(c));
-    // KConfig doesn't support long so we need to live with less precision on 64-bit systems
-    cg.writeEntry(QLatin1String("tabGroup") + n, static_cast<int>(reinterpret_cast<long>(c->tabGroup())));
     cg.writeEntry(QLatin1String("activities") + n, c->activities());
 }
 
@@ -286,8 +284,6 @@ void Workspace::addSessionInfo(KConfigGroup &cg)
         info->shortcut = cg.readEntry(QLatin1String("shortcut") + n, QString());
         info->active = (active_client == i);
         info->stackingOrder = cg.readEntry(QLatin1String("stackingOrder") + n, -1);
-        info->tabGroup = cg.readEntry(QLatin1String("tabGroup") + n, 0);
-        info->tabGroupClient = NULL;
         info->activities = cg.readEntry(QLatin1String("activities") + n, QStringList());
     }
 }
@@ -362,15 +358,6 @@ SessionInfo* Workspace::takeSessionInfo(Client* c)
             }
         }
     }
-
-    // Set tabGroupClient for other clients in the same group
-    if (realInfo && realInfo->tabGroup) {
-        foreach (SessionInfo * info, session) {
-            if (!info->tabGroupClient && info->tabGroup == realInfo->tabGroup)
-                info->tabGroupClient = c;
-        }
-    }
-
     return realInfo;
 }
 
diff --git a/sm.h b/sm.h
index b00cb3588..9fdcb547a 100644
--- a/sm.h
+++ b/sm.h
@@ -66,9 +66,7 @@ struct SessionInfo {
     bool active; // means 'was active in the saved session'
     int stackingOrder;
     float opacity;
-    int tabGroup; // Unique identifier for the client group that this window is in
 
-    Client* tabGroupClient; // The first client created that has an identical identifier
     QStringList activities;
 };
 
diff --git a/tabgroup.cpp b/tabgroup.cpp
deleted file mode 100644
index ee4b287cf..000000000
--- a/tabgroup.cpp
+++ /dev/null
@@ -1,360 +0,0 @@
-/*******************************************************************************
-KWin - the KDE window manager
-This file is part of the KDE project.
-
-Copyright (C) 2011/2012 The KWin team <kwin at kde.org>
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*******************************************************************************/
-
-#include "tabgroup.h"
-
-#include "client.h"
-#include "effects.h"
-#include "workspace.h"
-
-namespace KWin
-{
-
-TabGroup::TabGroup(AbstractClient *c)
-    : m_clients()
-    , m_current(c)
-    , m_minSize(c->minSize())
-    , m_maxSize(c->maxSize())
-    , m_stateUpdatesBlocked(0)
-    , m_pendingUpdates(TabGroup::None)
-{
-    QIcon icon(c->icon());
-    m_clients << c;
-    c->setTabGroup(this);
-    c->setClientShown(true);
-}
-
-TabGroup::~TabGroup()
-{
-}
-
-
-void TabGroup::activateNext()
-{
-    int index = m_clients.indexOf(m_current);
-    setCurrent(m_clients.at((index < m_clients.count() - 1) ? index + 1 : 0));
-}
-
-void TabGroup::activatePrev()
-{
-    int index = m_clients.indexOf(m_current);
-    setCurrent(m_clients.at((index > 0) ? index - 1 : m_clients.count() - 1));
-}
-
-bool TabGroup::add(AbstractClient* c, AbstractClient *other, bool after, bool becomeVisible)
-{
-    Q_ASSERT(!c->tabGroup());
-
-    if (contains(c) || !contains(other))
-        return false;
-
-    // Tabbed windows MUST have a decoration
-    c->setNoBorder(false);
-    if (c->noBorder())
-        return false;
-
-    // If it's not possible to have the same states then ungroup them, TODO: Check all states
-    // We do this here as the ungroup code in updateStates() cannot be called until add() completes
-
-    bool cannotTab = false;
-    ShadeMode oldShadeMode = c->shadeMode();
-    QRect oldGeom = c->geometry();
-    int oldDesktop = c->desktop();
-
-    c->setShade(m_current->shadeMode());
-    cannotTab = c->shadeMode() != m_current->shadeMode();
-    if (!cannotTab) {
-        c->setDesktop(m_current->desktop());
-        cannotTab = c->desktop() != m_current->desktop();
-    }
-    if (!cannotTab) {
-        c->setGeometry(m_current->geometry());
-        cannotTab = c->geometry() != m_current->geometry();
-    }
-
-    if (cannotTab) {
-        c->setShade(oldShadeMode);
-        c->setDesktop(oldDesktop);
-        c->setGeometry(oldGeom);
-        // trigger decoration repaint on the group to make sure that hover animations are properly reset.
-        m_current->triggerDecorationRepaint();
-        return false; // cannot tab
-    }
-
-    // Actually add to new group ----------------------------------------
-
-    // Notify effects of merge
-    if (effects)
-        static_cast<EffectsHandlerImpl*>(effects)->slotTabAdded(c->effectWindow(), other->effectWindow());
-
-    // next: aling the client states BEFORE adding it to the group
-    // otherwise the caused indirect state changes would be taken as the dominating ones and break
-    // the main client
-    // example: QuickTiling is aligned to None, this restores the former QuickTiled size and alignes
-    // all other windows in the group - including the actual main client! - to this size and thus
-    // breaks the actually required alignment to the main windows geometry (because that now has the
-    // restored geometry of the formerly Q'tiled window) - bug #303937
-    updateStates(m_current, All, c);
-
-    int index = other ? m_clients.indexOf(other) : m_clients.size();
-    index += after;
-    if (index > m_clients.size())
-        index = m_clients.size();
-
-    m_clients.insert(index, c);
-
-    c->setTabGroup(this);   // Let the client know which group it belongs to
-
-    updateMinMaxSize();
-
-    if (!becomeVisible)
-        c->setClientShown(false);
-    else {
-        c->setClientShown(true);
-        if (!effects || c->readyForPainting()) {
-            setCurrent(c);
-            if (options->focusPolicyIsReasonable())
-                workspace()->requestFocus( c );
-        }
-        else {
-            if (options->focusPolicyIsReasonable())
-                workspace()->requestFocus( m_current );
-            m_current = c; // setCurrent will be called by Toplevel::setReadyForPainting()
-        }
-    }
-
-    m_current->triggerDecorationRepaint();
-    return true;
-}
-
-bool TabGroup::remove(AbstractClient* c)
-{
-    if (!c)
-        return false;
-
-    int index = m_clients.indexOf(c);
-    if (index < 0)
-        return false;
-
-    c->setTabGroup(NULL);
-
-    m_clients.removeAt(index);
-    updateMinMaxSize();
-
-    if (m_clients.count() == 1) { // split
-        remove(m_clients.at(0));
-    }
-    if (m_clients.isEmpty()) { // remaining singleton "tab"
-        c->setClientShown(true);
-        return true; // group is gonna be deleted after this anyway
-    }
-
-    if (c == m_current) {
-        m_current = index < m_clients.count() ? m_clients.at(index) : m_clients.last();
-        m_current->setClientShown(true);
-
-        if (effects) // "c -> m_current" because c was m_current
-            static_cast<EffectsHandlerImpl*>(effects)->slotCurrentTabAboutToChange(c->effectWindow(), m_current->effectWindow());
-    }
-
-    // Notify effects of removal
-    if (effects)
-        static_cast<EffectsHandlerImpl*>(effects)->slotTabRemoved(c->effectWindow(), m_current->effectWindow());
-
-    m_current->triggerDecorationRepaint();
-    return true;
-}
-
-void TabGroup::closeAll()
-{
-    // NOTICE - in theory it's OK to use the list because closing sends an event to the client and
-    // due to the async X11 nature, the client would be released and thus removed from m_clients
-    // after this function exits.
-    // However later Wayland support or similar might not share this bahaviour - and we really had
-    // enough trouble with a polluted client list around the tabbing code ....
-    auto list(m_clients);
-    for (auto i = list.constBegin(), end = list.constEnd(); i != end; ++i)
-        if (*i != m_current)
-            (*i)->closeWindow();
-
-    m_current->closeWindow();
-}
-
-void TabGroup::move(AbstractClient *c, AbstractClient *other, bool after)
-{
-    if (c == other)
-        return;
-
-    int from = m_clients.indexOf(c);
-    if (from < 0)
-        return;
-
-    int to = other ? m_clients.indexOf(other) : m_clients.size() - 1;
-    if (to < 0)
-        return;
-    to += after;
-    if (to >= m_clients.size())
-        to = m_clients.size() - 1;
-
-    if (from == to)
-        return;
-
-    m_clients.move(from, to);
-    m_current->triggerDecorationRepaint();
-}
-
-bool TabGroup::isActive() const
-{
-    return contains(Workspace::self()->activeClient());
-}
-
-void TabGroup::setCurrent(AbstractClient* c, bool force)
-{
-    if ((c == m_current && !force) || !contains(c))
-        return;
-
-    // Notify effects of switch
-    if (effects)
-        static_cast<EffectsHandlerImpl*>(effects)->slotCurrentTabAboutToChange(m_current->effectWindow(), c->effectWindow());
-
-    m_current = c;
-    c->setClientShown(true); // reduce flicker?
-    for (auto i = m_clients.constBegin(), end = m_clients.constEnd(); i != end; ++i)
-        (*i)->setClientShown((*i) == m_current);
-}
-
-void TabGroup::sync(const char *property, AbstractClient *c)
-{
-    if (c->metaObject()->indexOfProperty(property) > -1) {
-        qCWarning(KWIN_CORE, "caught attempt to sync non dynamic property: %s", property);
-        return;
-    }
-    QVariant v = c->property(property);
-    for (auto i = m_clients.begin(), end = m_clients.end(); i != end; ++i) {
-        if (*i != m_current)
-            (*i)->setProperty(property, v);
-    }
-}
-
-void TabGroup::updateMinMaxSize()
-{
-    // Determine entire group's minimum and maximum sizes
-    // TODO this used to be signalled out but i didn't find a receiver - or got an idea what this would be good for
-    // find purpose & solution or kick it
-//     QSize oldMin = m_minSize;
-//     QSize oldMax = m_maxSize;
-    m_minSize = QSize(0, 0);
-    m_maxSize = QSize(INT_MAX, INT_MAX);
-
-    for (auto i = m_clients.constBegin(); i != m_clients.constEnd(); ++i) {
-        m_minSize = m_minSize.expandedTo((*i)->minSize());
-        m_maxSize = m_maxSize.boundedTo((*i)->maxSize());
-    }
-
-    // TODO: this actually resolves a conflict that should be caught when adding?
-    m_maxSize = m_maxSize.expandedTo(m_minSize);
-
-    // calculate this _once_ to get a common size.
-    // TODO this leaves another unresolved conflict about the base increment (luckily not used too often)
-    const QSize size = m_current->clientSize().expandedTo(m_minSize).boundedTo(m_maxSize);
-    if (size != m_current->clientSize()) {
-        const QRect r(m_current->pos(), m_current->sizeForClientSize(size));
-        for (auto i = m_clients.constBegin(), end = m_clients.constEnd(); i != end; ++i)
-            (*i)->setGeometry(r);
-    }
-}
-
-
-void TabGroup::blockStateUpdates(bool more) {
-    more ? ++m_stateUpdatesBlocked : --m_stateUpdatesBlocked;
-    if (m_stateUpdatesBlocked < 0) {
-        m_stateUpdatesBlocked = 0;
-        qCWarning(KWIN_CORE, "TabGroup: Something is messed up with TabGroup::blockStateUpdates() invocation\nReleased more than blocked!");
-    }
-}
-
-void TabGroup::updateStates(AbstractClient* main, States states, AbstractClient* only)
-{
-    if (main == only)
-        return; // there's no need to only align "us" to "us"
-    if (m_stateUpdatesBlocked > 0) {
-        m_pendingUpdates |= states;
-        return;
-    }
-
-    states |= m_pendingUpdates;
-    m_pendingUpdates = TabGroup::None;
-
-    QVector<AbstractClient*> toBeRemoved, onlyDummy;
-    auto *list = &m_clients;
-    if (only) {
-        onlyDummy << only;
-        list = &onlyDummy;
-    }
-
-    for (auto i = list->constBegin(), end = list->constEnd(); i != end; ++i) {
-        auto *c = (*i);
-        if (c != main) {
-            if ((states & Minimized) && c->isMinimized() != main->isMinimized()) {
-                if (main->isMinimized())
-                    c->minimize(true);
-                else
-                    c->unminimize(true);
-            }
-
-            // the order QuickTile -> Maximized -> Geometry is somewhat important because one will change the other
-            // don't change w/o good reason and care
-            if ((states & QuickTile) && c->quickTileMode() != main->quickTileMode())
-                c->setQuickTileMode(main->quickTileMode());
-            if ((states & Maximized) && c->maximizeMode() != main->maximizeMode())
-                c->maximize(main->maximizeMode());
-            // the order Shaded -> Geometry is somewhat important because one will change the other
-            if ((states & Shaded))
-                c->setShade(main->shadeMode());
-            if ((states & Geometry) && c->geometry() != main->geometry())
-                c->setGeometry(main->geometry());
-            if (states & Desktop) {
-                if (c->isOnAllDesktops() != main->isOnAllDesktops())
-                    c->setOnAllDesktops(main->isOnAllDesktops());
-                if (c->desktop() != main->desktop())
-                    c->setDesktop(main->desktop());
-            }
-            if ((states & Activity) && c->activities() != main->activities()) {
-                c->setOnActivities(main->activities());
-            }
-            if (states & Layer) {
-                if (c->keepAbove() != main->keepAbove())
-                    c->setKeepAbove(main->keepAbove());
-                if (c->keepBelow() != main->keepBelow())
-                    c->setKeepBelow(main->keepBelow());
-            }
-
-            // If it's not possible to have the same states then ungroup them, TODO: Check all states
-            if (((states & Geometry) && c->geometry() != main->geometry()) ||
-                ((states & Desktop) && c->desktop() != main->desktop()))
-                toBeRemoved << c;
-        }
-    }
-
-    for (auto i = toBeRemoved.constBegin(), end = toBeRemoved.constEnd(); i != end; ++i)
-        remove(*i);
-}
-
-}
diff --git a/tabgroup.h b/tabgroup.h
deleted file mode 100644
index f4f6b4439..000000000
--- a/tabgroup.h
+++ /dev/null
@@ -1,209 +0,0 @@
-/*******************************************************************************
-KWin - the KDE window manager
-This file is part of the KDE project.
-
-Copyright (C) 2011/2012 The KWin team <kwin at kde.org>
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*******************************************************************************/
-
-#ifndef KWIN_TABGROUP_H
-#define KWIN_TABGROUP_H
-
-#include <QObject>
-
-#include "utils.h"
-
-namespace KWin
-{
-
-class AbstractClient;
-
-/**
- * This class represents a group of clients for use in window tabbing. All
- * clients in the group share the same geometry and state information; I.e if
- * one client changes then all others should also be changed.
- *
- * A group contains at least one client and DOES NOT contain multiple
- * copies of the same client. A client MUST NOT be in two groups at the same
- * time. All decorated clients SHOULD be in a group, even if it's a group of
- * one client.
- *
- * rohanp: Had to convert this object to a QObject to make it easier for adding
- * scripting interface to TabGroup.
- *
- * If a group contains multiple clients then only one will ever be mapped at
- * any given time.
- */
-class TabGroup
-{
-public:
-    /**
-     * Creates a new group containing \p c.
-     */
-    explicit TabGroup(AbstractClient* c);
-    ~TabGroup();
-
-    enum State {
-        None = 0, Minimized = 1<<0, Maximized = 1<<1, Shaded = 1<<2,
-        Geometry = 1<<3, Desktop = 1<<4, Activity = 1<<5,
-        Layer = 1<<6, QuickTile = 1<<7, All = 0xffffffff
-    };
-    Q_DECLARE_FLAGS(States, State)
-
-    /**
-     * Activate next tab (flips)
-     */
-    void activateNext();
-
-    /**
-     * Activate previous tab (flips)
-     */
-    void activatePrev();
-
-    /**
-     * Allows to alter several attributes in random order and trigger a general update at the end
-     * (must still be explicitly called)
-     * this is to prevent side effects, mostly for geometry adjustments during maximization and QuickTiling
-     */
-    void blockStateUpdates(bool);
-
-    /**
-     * Close all clients in this group.
-     */
-    void closeAll();
-
-    /**
-     * Whether client \p c is member of this group
-     */
-    bool contains(AbstractClient* c) const;
-
-    /**
-     * The amount of clients in this group
-     */
-    int count() const;
-
-    /**
-     * Returns whether or not this group contains the active client.
-     */
-    bool isActive() const;
-
-    /**
-     * Returns whether this group is empty (used by workspace to remove it)
-     */
-    bool isEmpty() const;
-
-    /**
-     * Returns the list of all the clients contained in this group in their current order.
-     */
-    const QVector<AbstractClient*> &clients() const;
-
-    /**
-     * Returns the currently visible client.
-     */
-    AbstractClient* current() const;
-    /**
-     * Makes \p c the visible client in the group - force is only used when the window becomes ready for painting.
-     * Any other usage just causes pointless action
-     */
-    void setCurrent(AbstractClient* c, bool force = false);
-
-    /**
-     * Alignes the dynamic Qt @param property of all clients to the one of @param c
-     */
-    void sync(const char *property, AbstractClient *c);
-
-    /**
-     * Returns combined minimum size of all clients in the group.
-     */
-    QSize minSize() const;
-    /**
-     * Returns combined maximum size of all clients in the group.
-     */
-    QSize maxSize() const;
-
-    /**
-     * Ensures that all the clients in the group have identical geometries and states using
-     * \p main as the primary client to copy the settings off. If \p only is set then only
-     * that client is updated to match \p main.
-     */
-    void updateStates(AbstractClient* main, States states, AbstractClient* only = NULL);
-
-    /**
-     * updates geometry restrictions of this group, basically called from Client::getWmNormalHints(), otherwise rather private
-     */
-    void updateMinMaxSize();
-
-Q_SIGNALS:
-    void minSizeChanged();
-    void maxSizeChanged();
-
-private:
-    friend class AbstractClient;
-    friend class Client;
-//     friend bool Client::tabTo(Client*, bool, bool);
-    bool add(KWin::AbstractClient *c, AbstractClient *other, bool behind, bool activateC);
-    void move(KWin::AbstractClient* c, KWin::AbstractClient* before, bool behind);
-
-//     friend bool Client::untab(const QRect&);
-    bool remove(KWin::AbstractClient *c);
-
-    QVector<AbstractClient*> m_clients;
-    AbstractClient *m_current;
-    QSize m_minSize;
-    QSize m_maxSize;
-    int m_stateUpdatesBlocked;
-    States m_pendingUpdates;
-};
-
-inline bool TabGroup::contains(AbstractClient* c) const
-{
-    return c && m_clients.contains(c);
-}
-
-inline int TabGroup::count() const
-{
-    return m_clients.count();
-}
-
-inline const QVector<AbstractClient*> &TabGroup::clients() const
-{
-    return m_clients;
-}
-
-inline bool TabGroup::isEmpty() const
-{
-    return m_clients.isEmpty();
-}
-
-inline AbstractClient* TabGroup::current() const
-{
-    return m_current;
-}
-
-inline QSize TabGroup::minSize() const
-{
-    return m_minSize;
-}
-
-inline QSize TabGroup::maxSize() const
-{
-    return m_maxSize;
-}
-
-}
-
-Q_DECLARE_OPERATORS_FOR_FLAGS(KWin::TabGroup::States)
-
-#endif
diff --git a/toplevel.cpp b/toplevel.cpp
index ae1e1d46e..ec23d754f 100644
--- a/toplevel.cpp
+++ b/toplevel.cpp
@@ -504,10 +504,6 @@ void Toplevel::setReadyForPainting()
         if (compositing()) {
             addRepaintFull();
             emit windowShown(this);
-            if (auto *cl = dynamic_cast<AbstractClient*>(this)) {
-                if (cl->tabGroup() && cl->tabGroup()->current() == cl)
-                    cl->tabGroup()->setCurrent(cl, true);
-            }
         }
     }
 }
diff --git a/useractions.cpp b/useractions.cpp
index 67e3c3a19..aa998c287 100644
--- a/useractions.cpp
+++ b/useractions.cpp
@@ -83,8 +83,6 @@ UserActionsMenu::UserActionsMenu(QObject *parent)
     , m_desktopMenu(NULL)
     , m_screenMenu(NULL)
     , m_activityMenu(NULL)
-    , m_addTabsMenu(NULL)
-    , m_switchToTabMenu(NULL)
     , m_scriptsMenu(NULL)
     , m_resizeOperation(NULL)
     , m_moveOperation(NULL)
@@ -96,8 +94,6 @@ UserActionsMenu::UserActionsMenu(QObject *parent)
     , m_noBorderOperation(NULL)
     , m_minimizeOperation(NULL)
     , m_closeOperation(NULL)
-    , m_removeFromTabGroup(NULL)
-    , m_closeTabGroup(NULL)
 {
 }
 
@@ -354,20 +350,6 @@ void UserActionsMenu::init()
     setShortcut(m_minimizeOperation, QStringLiteral("Window Minimize"));
     m_minimizeOperation->setData(Options::MinimizeOp);
 
-    // Actions for window tabbing
-    if (false) {
-        m_removeFromTabGroup = m_menu->addAction(i18n("&Untab"));
-        setShortcut(m_removeFromTabGroup, QStringLiteral("Untab"));
-        m_removeFromTabGroup->setData(Options::RemoveTabFromGroupOp);
-
-        m_closeTabGroup = m_menu->addAction(i18n("Close Entire &Group"));
-        m_closeTabGroup->setIcon(QIcon::fromTheme(QStringLiteral("window-close")));
-        setShortcut(m_closeTabGroup, QStringLiteral("Close TabGroup"));
-        m_closeTabGroup->setData(Options::CloseTabGroupOp);
-
-        m_menu->addSeparator();
-    }
-
     action = m_menu->addMenu(advancedMenu);
     action->setText(i18n("&More Actions"));
     action->setIcon(QIcon::fromTheme(QStringLiteral("view-more-symbolic")));
@@ -386,8 +368,6 @@ void UserActionsMenu::discard()
     m_multipleDesktopsMenu = nullptr;
     m_screenMenu = NULL;
     m_activityMenu = NULL;
-    m_switchToTabMenu = NULL;
-    m_addTabsMenu = NULL;
     m_scriptsMenu = NULL;
 }
 
@@ -428,17 +408,9 @@ void UserActionsMenu::menuAboutToShow()
     m_closeOperation->setEnabled(m_client->isCloseable());
     m_shortcutOperation->setEnabled(m_client->rules()->checkShortcut(QString()).isNull());
 
-    if (false) {
-        initTabbingPopups();
-        m_addTabsMenu->setPalette(m_client->palette());
-    } else {
-        delete m_addTabsMenu;
-        m_addTabsMenu = 0;
-    }
-
     // drop the existing scripts menu
     delete m_scriptsMenu;
-    m_scriptsMenu = NULL;
+    m_scriptsMenu = nullptr;
     // ask scripts whether they want to add entries for the given Client
     QList<QAction*> scriptActions = Scripting::self()->actionsForUserActionMenu(m_client.data(), m_scriptsMenu);
     if (!scriptActions.isEmpty()) {
@@ -475,118 +447,6 @@ void UserActionsMenu::showHideActivityMenu()
 #endif
 }
 
-void UserActionsMenu::selectPopupClientTab(QAction* action)
-{
-    if (!m_client || !m_client->tabGroup() || !action->data().isValid()) {
-        return;
-    }
-
-    if (AbstractClient *other = action->data().value<AbstractClient*>()) {
-        m_client->tabGroup()->setCurrent(other);
-        return;
-    }
-
-    // failed conversion, try "1" & "2", being prev and next
-    int direction = action->data().toInt();
-    if (direction == 1) {
-        m_client->tabGroup()->activatePrev();
-    } else if (direction == 2) {
-        m_client->tabGroup()->activateNext();
-    }
-}
-
-static QString shortCaption(const QString &s)
-{
-    if (s.length() < 64)
-        return s;
-    QString ss = s;
-    return ss.replace(32,s.length()-64, QStringLiteral("..."));
-}
-
-void UserActionsMenu::rebuildTabListPopup()
-{
-    Q_ASSERT(m_switchToTabMenu);
-
-    m_switchToTabMenu->clear();
-    // whatever happens "0x1" and "0x2" are no heap positions ;-)
-    m_switchToTabMenu->addAction(i18nc("Switch to tab -> Previous", "Previous"))->setData(1);
-    m_switchToTabMenu->addAction(i18nc("Switch to tab -> Next", "Next"))->setData(2);
-
-    m_switchToTabMenu->addSeparator();
-
-    if (!m_client) {
-        return;
-    }
-    for (auto i = m_client->tabGroup()->clients().constBegin(),
-                                        end = m_client->tabGroup()->clients().constEnd(); i != end; ++i) {
-        if ((*i)->noBorder() || *i == m_client->tabGroup()->current())
-            continue; // cannot tab there anyway
-        m_switchToTabMenu->addAction(shortCaption((*i)->caption()))->setData(QVariant::fromValue(*i));
-    }
-}
-
-void UserActionsMenu::entabPopupClient(QAction* action)
-{
-    if (m_client.isNull() || !action->data().isValid()) {
-        return;
-    }
-    AbstractClient *other = action->data().value<AbstractClient*>();
-    if (!Workspace::self()->allClientList().contains(other)) { // might have been lost betwenn pop-up and selection
-        return;
-    }
-
-    m_client->tabBehind(other, true);
-    if (options->focusPolicyIsReasonable()) {
-        Workspace::self()->requestFocus(m_client);
-    }
-}
-
-void UserActionsMenu::rebuildTabGroupPopup()
-{
-    Q_ASSERT(m_addTabsMenu);
-
-    m_addTabsMenu->clear();
-    const auto &clientList = Workspace::self()->allClientList();
-    for (auto i = clientList.constBegin(), end = clientList.constEnd(); i != end; ++i) {
-        if (*i == m_client.data() || (*i)->noBorder())
-            continue;
-        m_addTabsMenu->addAction(shortCaption((*i)->caption()))->setData(QVariant::fromValue(*i));
-    }
-    if (m_addTabsMenu->actions().isEmpty())
-        m_addTabsMenu->addAction(i18nc("There's no window available to be attached as tab to this one", "None available"))->setEnabled(false);
-}
-
-void UserActionsMenu::initTabbingPopups()
-{
-    bool needTabManagers = false;
-    Q_ASSERT(m_client);
-    if (!m_client)
-        return;
-    if (m_client->tabGroup() && m_client->tabGroup()->count() > 1) {
-        needTabManagers = true;
-        if (!m_switchToTabMenu) {
-            m_switchToTabMenu = new QMenu(i18n("Switch to Tab"), m_menu);
-            connect(m_switchToTabMenu, &QMenu::triggered,   this, &UserActionsMenu::selectPopupClientTab);
-            connect(m_switchToTabMenu, &QMenu::aboutToShow, this, &UserActionsMenu::rebuildTabListPopup);
-            m_menu->insertMenu(m_removeFromTabGroup, m_switchToTabMenu);
-        }
-    } else {
-        delete m_switchToTabMenu;
-        m_switchToTabMenu = 0;
-    }
-
-    if (!m_addTabsMenu) {
-        m_addTabsMenu = new QMenu(i18n("&Attach as tab to"), m_menu);
-        connect(m_addTabsMenu, &QMenu::triggered,   this, &UserActionsMenu::entabPopupClient);
-        connect(m_addTabsMenu, &QMenu::aboutToShow, this, &UserActionsMenu::rebuildTabGroupPopup);
-        m_menu->insertMenu(m_removeFromTabGroup, m_addTabsMenu);
-    }
-
-    m_addTabsMenu->menuAction()->setEnabled(!m_client->isFullScreen());
-    m_removeFromTabGroup->setVisible(needTabManagers);
-    m_closeTabGroup->setVisible(needTabManagers);
-}
-
 void UserActionsMenu::initDesktopPopup()
 {
     if (kwinApp()->operationMode() == Application::OperationModeWaylandOnly ||
@@ -1270,24 +1130,8 @@ void Workspace::performWindowOperation(AbstractClient* c, Options::WindowOperati
     case Options::LowerOp:
         lowerClient(c);
         break;
-    case Options::TabDragOp: // Handled by decoration itself
     case Options::NoOp:
         break;
-    case Options::RemoveTabFromGroupOp:
-        if (c->untab(c->geometry().translated(cascadeOffset(c))) && options->focusPolicyIsReasonable())
-             takeActivity(c, ActivityFocus | ActivityRaise);
-        break;
-    case Options::ActivateNextTabOp:
-        if (c->tabGroup())
-            c->tabGroup()->activateNext();
-        break;
-    case Options::ActivatePreviousTabOp:
-        if (c->tabGroup())
-            c->tabGroup()->activatePrev();
-        break;
-    case Options::CloseTabGroupOp:
-        c->tabGroup()->closeAll();
-        break;
     }
 }
 
@@ -1309,9 +1153,6 @@ Options::WindowOperation Client::mouseButtonToWindowOperation(Qt::MouseButtons b
     else if (button == Qt::RightButton)
         com = active ? options->commandActiveTitlebar3() : options->commandInactiveTitlebar3();
 
-    // TODO: Complete the list
-    if (com == Options::MouseDragTab)
-        return Options::TabDragOp;
     if (com == Options::MouseOperationsMenu)
         return Options::OperationsOp;
     return Options::NoOp;
@@ -1647,24 +1488,6 @@ void Workspace::slotWindowToDesktopDown()
     }
 }
 
-void Workspace::slotActivateNextTab()
-{
-    if (active_client && active_client->tabGroup())
-        active_client->tabGroup()->activateNext();
-}
-
-void Workspace::slotActivatePrevTab()
-{
-    if (active_client && active_client->tabGroup())
-        active_client->tabGroup()->activatePrev();
-}
-
-void Workspace::slotUntab()
-{
-    if (active_client)
-        active_client->untab(active_client->geometry().translated(cascadeOffset(active_client)));
-}
-
 /**
  * Kill Window feature, similar to xkill.
  */
@@ -1762,8 +1585,6 @@ bool Workspace::switchWindow(AbstractClient *c, Direction direction, QPoint curP
         }
     }
     if (switchTo) {
-        if (switchTo->tabGroup())
-            switchTo = switchTo->tabGroup()->current();
         activateClient(switchTo);
     }
 
diff --git a/useractions.h b/useractions.h
index 28840def5..af93bcc0a 100644
--- a/useractions.h
+++ b/useractions.h
@@ -120,26 +120,6 @@ private Q_SLOTS:
      * Adjust the items according to the respective Client.
      */
     void menuAboutToShow();
-    /**
-     * Adjusts the add to tab group menu to the current value of the Client.
-     */
-    void rebuildTabGroupPopup();
-    /**
-     * Adjusts the switch to tab menu to the current values of the Client.
-     */
-    void rebuildTabListPopup();
-    /**
-     * Adds the Client as tab to the Client identified by the @p action.
-     *
-     * @param action The invoked action containing the Client to which the active Client should be tabbed.
-     */
-    void entabPopupClient(QAction *action);
-    /**
-     * Activates the selected tabbed Client.
-     *
-     * @param action The invoked action containing the tabbed Client which should be activated.
-     */
-    void selectPopupClientTab(QAction *action);
     /**
      * Adjusts the desktop popup to the current values and the location of
      * the Client.
@@ -210,10 +190,6 @@ private:
      * Oh, and an 'all' option too of course
      */
     void initActivityPopup();
-    /**
-     * Creates the Window Tabbing related menus.
-     */
-    void initTabbingPopups();
     /**
      * Shows a helper Dialog to inform the user how to get back in case he triggered
      * an action which hides the window decoration (e.g. NoBorder or Fullscreen).
@@ -241,14 +217,6 @@ private:
      * The activities sub menu.
      */
     QMenu* m_activityMenu;
-    /**
-     * Menu to add the group to other group.
-     */
-    QMenu* m_addTabsMenu;
-    /**
-     * Menu to change tab.
-     */
-    QMenu* m_switchToTabMenu;
     /**
      * Menu for further entries added by scripts.
      */
@@ -264,14 +232,6 @@ private:
     QAction* m_minimizeOperation;
     QAction* m_closeOperation;
     QAction* m_shortcutOperation;
-    /**
-     * Remove client from group.
-     */
-    QAction* m_removeFromTabGroup;
-    /**
-     * Close all clients in the group.
-     */
-    QAction* m_closeTabGroup;
     /**
      * The Client for which the menu is shown.
      */
diff --git a/workspace.cpp b/workspace.cpp
index ec5c8006b..ded62dd5a 100644
--- a/workspace.cpp
+++ b/workspace.cpp
@@ -695,8 +695,6 @@ void Workspace::removeClient(Client* c)
         m_userActionsMenu->close();
     }
 
-    c->untab(QRect(), true);
-
     if (client_keys_client == c)
         setupWindowShortcutDone(false);
     if (!c->shortcut().isEmpty()) {
@@ -780,8 +778,7 @@ void Workspace::updateToolWindows(bool also_hide)
     // TODO: What if Client's transiency/group changes? should this be called too? (I'm paranoid, am I not?)
     if (!options->isHideUtilityWindowsForInactive()) {
         for (ClientList::ConstIterator it = clients.constBegin(); it != clients.constEnd(); ++it)
-            if (!(*it)->tabGroup() || (*it)->tabGroup()->current() == *it)
-                (*it)->hideClient(false);
+            (*it)->hideClient(false);
         return;
     }
     const Group* group = nullptr;
diff --git a/workspace.h b/workspace.h
index a59703ee8..1aff18e2e 100644
--- a/workspace.h
+++ b/workspace.h
@@ -455,10 +455,6 @@ public Q_SLOTS:
 
     void updateClientArea();
 
-    void slotActivateNextTab(); // Slot to move left the active Client.
-    void slotActivatePrevTab(); // Slot to move right the active Client.
-    void slotUntab(); // Slot to remove the active client from its group.
-
 private Q_SLOTS:
     void desktopResized();
     void selectWmInputEventMask();


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