D7894: Only try creating X11 shadow 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 it crashes for the first window being created in a
  KWin/Wayland without XWayland support.

REPOSITORY
  R108 KWin

BRANCH
  shadow-x11

REVISION DETAIL
  https://phabricator.kde.org/D7894

AFFECTED FILES
  shadow.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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