D16927: KTextEditor : disconnect contextmenu from all aboutToXXContextMenu receivers

[René J.V. Bertin]

rjvbb created this revision.
rjvbb added reviewers: KTextEditor, Frameworks.
rjvbb added a project: KTextEditor.
Herald added projects: Kate, Frameworks.
Herald added a subscriber: kwrite-devel.
rjvbb requested review of this revision.

REVISION SUMMARY
  `ViewPrivate::contextMenu()` has a surprising way of handling the `ktexteditor_popup` menu aboutToXXX signals: it disconnects them from the current ViewPrivate instance and then reconnects them to the same instance.
  
  I think the disconnect should be from all receivers that were once connected to the menu show & hide signals. Doing that resolves the issue where `ViewPrivate::aboutToShowContextMenu()` is called for all open KTextEditorViews that once had the context menu open, instead of only for the view that is currently active.
  
  BUG: https://bugs.kde.org/show_bug.cgi?id=401069

TEST PLAN
  Build KTextEditor with a debug trace to `ViewPrivate::aboutToShowContextMenu()`, e.g.
  
    void KTextEditor::ViewPrivate::aboutToShowContextMenu()
    {
        QMenu *menu = qobject_cast<QMenu *>(sender());
    
        if (menu) {
            if (mainWindow()->activeView() == this) {
                qWarning() << Q_FUNC_INFO << "emitting contextMenuAboutToShow for foreground view" << this;
                emit contextMenuAboutToShow(this, menu);
            } else {
                qWarning() << Q_FUNC_INFO << "NOT emitting contextMenuAboutToShow for background view" << this;
            }
        }
    }
  
  Now open Kate with multiple documents. Right-click in the active document, notice only that view emits `contextMenuAboutToShow`. Activate other documents one after the other, right-clicking in them, and notice how the previously active documents would have emitted the `contextMenuAboutToShow` signal.
  
  This is resolved by applying this patch. Opening the context menu in a long-running multi-document session keeps feeling snappier during the entire session too.

REPOSITORY
  R39 KTextEditor

REVISION DETAIL
  https://phabricator.kde.org/D16927

AFFECTED FILES
  src/view/kateview.cpp

To: rjvbb, #ktexteditor, #frameworks
Cc: kde-frameworks-devel, kwrite-devel, michaelh, ngraham, bruns, demsking, head7, cullmann, kfunk, sars, dhaumann
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