D24657: Add support for _GTK_FRAME_EXTENTS

[Vlad Zahorodnii]

zzag added a dependent revision: D24660: [x11] Add support for 
_GTK_FRAME_EXTENTS.

REPOSITORY
  R278 KWindowSystem

REVISION DETAIL
  https://phabricator.kde.org/D24657

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