[Differential] [Request, 60 lines] D2185: Handle restart of Compositor Scene correctly for Wayland client

[graesslin (Martin Gräßlin)]

graesslin created this revision.
graesslin added reviewers: KWin, Plasma on Wayland.
Restricted Application added subscribers: kwin, plasma-devel.
Restricted Application added projects: Plasma on Wayland, KWin.

REVISION SUMMARY
  This change ensures that KWin doesn't crash in the QPainter scene if
  the compositor gets restarted and if there are Wayland clients.
  
  BUG: 365471

TEST PLAN
  Test case added to scene qpainter which triggers a restart
  of the Compositor with a window being shown. Verifies that rendering
  is correct afterwards.

REPOSITORY
  rKWIN KWin

BRANCH
  restart-scene-dont-crash

REVISION DETAIL
  https://phabricator.kde.org/D2185

AFFECTED FILES
  autotests/integration/scene_qpainter_test.cpp
  composite.cpp

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: graesslin, #kwin, #plasma_on_wayland
Cc: plasma-devel, kwin, hardening, jensreuterberg, abetts, sebas
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