D7531: Update SurfaceInterface outputs when an output global gets destroyed

[David Edmundson]

davidedmundson created this revision.
Restricted Application added projects: Plasma on Wayland, Frameworks.
Restricted Application added subscribers: Frameworks, plasma-devel.

REVISION SUMMARY
  As per existing TODO.
  
  A new signal is added on Global to emit so we can process the result
  whist we still have a valid object. The name is overly explicit to try
  and logically separate it from QObject::destroyed().

TEST PLAN
  Updated existing unit test.

REPOSITORY
  R127 KWayland

BRANCH
  mart/xdgforeign

REVISION DETAIL
  https://phabricator.kde.org/D7531

AFFECTED FILES
  autotests/client/test_wayland_surface.cpp
  src/client/event_queue.cpp
  src/server/global.cpp
  src/server/global.h
  src/server/surface_interface.cpp

To: davidedmundson, #plasma
Cc: plasma-devel, #frameworks, leezu, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, eliasp, sebas, apol, mart, hein, lukas
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