D5723: Cleanup wayland resources used in kwindowsystem before they're deleted by QPA

[David Edmundson]

davidedmundson created this revision.
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Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  When the Qt QPA closes it deletes the wl_display
  deleting wl_display deletes the wl_registry
  when we destroy the kwayland wrapper we double delete
  as the windowsystem integration is a singleton we're not deleted till
  after qApp.
  
  By manually releasing the wayland parts early we avoid that problem,
  whilst still being safe if any app did make a KWindowSystem call during
  shutdown.
  
  BUG: 374665

TEST PLAN
  Locked screen, no longer crashed when typing in password
  Opened system settings, created a blurred tooltip then closed. No longer crashed
  
  Making a unit test that runs during qApp shutdown will be incredibly difficult.

REPOSITORY
  R130 Frameworks integration plugin using KWayland

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D5723

AFFECTED FILES
  src/windowsystem/waylandintegration.cpp

To: davidedmundson, #plasma
Cc: plasma-devel, spstarr, progwolff, Zren, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, lukas
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