D18582: Add explicit SurfaceInterface::commited signal

[David Edmundson]

davidedmundson created this revision.
davidedmundson added a reviewer: KWin.
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REVISION SUMMARY
  Whilst some interfaces that are double-buffered against the wl_surface
  are proxied through SurfaceInterface, some are not, most notably
  XdgShell.
  
  We need some low level signal to know when the surface has been
  committed which doesn't rely on their being a damaged buffer.

TEST PLAN
  Unit test 
  Used in kwin

REPOSITORY
  R127 KWayland

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D18582

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

To: davidedmundson, #kwin
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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