D7892: Only call xcb_flush in performCompositing if we have an X11 connection

[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
  Otherwise KWin crashes when operating without XWayland support.

REPOSITORY
  R108 KWin

BRANCH
  composite-no-flush

REVISION DETAIL
  https://phabricator.kde.org/D7892

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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