D7504: Do not hard runtime depend on X11 in composite startup

[Martin Flöser]

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

REVISION SUMMARY
  The compositor needs to claim the X11 compositor selection and redirect
  the X11 windows. This of course only makes sense when having X11 support.
  
  This change refactors the code so that if X11 support is missing the code
  is not executed, but as soon as X11 support comes available the selection
  gets claimed.
  
  Also if the connection goes away the selection is deleted, though it
  might be that this does not work as KSelectionOwner might call into xcb
  and cause a crash. This needs to be tested once we start supporting
  XWayland going away.

REPOSITORY
  R108 KWin

BRANCH
  composite-no-x11

REVISION DETAIL
  https://phabricator.kde.org/D7504

AFFECTED FILES
  composite.cpp
  composite.h

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