D7651: Protect readProperty and deleteProperty in case of no X11

[Martin Flöser]

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

REVISION SUMMARY
  Read(Window)Property and deleteProperty should only operate if there is
  an X11 connection available.
  
  In addition the methods are changed to the x11 wrappers provided on the
  KWin::Application as that one can support restarting XWayland in opposite
  to the global methods.

TEST PLAN
  Compiles

REPOSITORY
  R108 KWin

BRANCH
  effects-x11-protection

REVISION DETAIL
  https://phabricator.kde.org/D7651

AFFECTED FILES
  effects.cpp

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