D22053: [libtaskmanager] Track stacking order and window activation (on X11)

[Eike Hein]

hein created this revision.
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REVISION SUMMARY
  `TaskGroupingProxyModel::requestToggleMaximized` now uses this to
  minimize and restore groups of windows while preserving the
  stacking order, a frequently user-requested wish.
  BUG:368867
  
  Window activation is additionally tracked to implement a new front-
  end feature to activate the most recently active window (or fall
  through to stacking order otherwise) subsequently.
  CCBUG:379259
  
  A Wayland implementation requires the addition of a
  `PlasmaWindowManagement::stackingOrder()`, which should be a QList
  of PlasmaWindow* in stacking order, along with a change signal. We
  discussed this at the Plasma+KWin sprint and I'll code up patches
  to KWin and KWayland soon and then implement the new API in here.

REPOSITORY
  R120 Plasma Workspace

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D22053

AFFECTED FILES
  libtaskmanager/abstracttasksmodel.h
  libtaskmanager/taskgroupingproxymodel.cpp
  libtaskmanager/xwindowtasksmodel.cpp

To: hein, #plasma
Cc: ngraham, plasma-devel, LeGast00n, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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