D8663: Force Software QtQuick rendering when starting with QPainter compositor

[Martin Flöser]

graesslin created this revision.
graesslin added reviewers: KWin, Plasma.
Restricted Application added a project: KWin.
Restricted Application added subscribers: kwin, plasma-devel.

REVISION SUMMARY
  If KWin/Wayland starts up with the QPainter compositor we force software
  rendering in QtQuick. It doesn't make sense to try to use the OpenGL
  renderer as that normally just results in an abort when trying to create
  the QOpenGLContext.

TEST PLAN
  Run KWin with KWIN_COMPOSE=Q, tried to quick tile a window and
  used Alt+Tab. Worked fine, didn't crash anymore.

REPOSITORY
  R108 KWin

BRANCH
  software-qtquick-on-pqainter

REVISION DETAIL
  https://phabricator.kde.org/D8663

AFFECTED FILES
  composite.cpp

To: graesslin, #kwin, #plasma
Cc: plasma-devel, kwin, bwowk, ZrenBot, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart
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