D27860: [server] Add some sub-surface life cycle signals

[Vlad Zahorodnii]

zzag created this revision.
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REVISION SUMMARY
  These signals can be very useful when one wants to monitor changes in a
  sub-surface tree.

REPOSITORY
  R127 KWayland

REVISION DETAIL
  https://phabricator.kde.org/D27860

AFFECTED FILES
  src/server/surface_interface.cpp
  src/server/surface_interface.h

To: zzag, #kwin
Cc: kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, bruns
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