[Bug 1446865]

[Thomas-luebking]

For a KMainWindow solution, one should not require a nasty global
eventfilter on the application - handling KMainWindow::closeEvent()
should be sufficient, but there might be an additional pitfall on modal
windows (ie. if there's already a save dialog, we might have to
forcefully activate that to cause user interaction)

However, as long as QGuiApplication cancels the session lougout as long
as any close event is ignored, this cannot be applied either (ie. still
requires your new patch to Qt) and, of course, this doesn't provide a
solution for Qt5 either - session management on Qt5 will remain broken
forever and just some KDE applications work around that. That's a pretty
crappy situation :-(

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https://bugs.launchpad.net/bugs/1446865

Title:
  KDE5/Qt5 does not support session restoration

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