D17758: Disable KDE ServerDecoration on Qt > 5.12

[David Edmundson]

davidedmundson created this revision.
davidedmundson added reviewers: KWin, Plasma.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
davidedmundson requested review of this revision.

REVISION SUMMARY
  XdgDecoration is built into QtWayland 5.12. Running two interfaces to do
  the same thing would be messy.
  
  We cannot just remove this code as Plasma 5.15 will depend on Qt5.11.
  
  Detection of the ShellSurfaceInterface was used to test if we have run
  shellSurfaceCreated which we still need for other functions, so this check 
  is replaced with a new explicit property.

TEST PLAN
  Got the correct decorations still.
  I haven't tested on Qt5.11. I would appreciate someone checking that 
  things still work the same.

REPOSITORY
  R135 Integration for Qt applications in Plasma

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D17758

AFFECTED FILES
  src/platformtheme/kwaylandintegration.cpp

To: davidedmundson, #kwin, #plasma
Cc: plasma-devel, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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