[gtk] (4 commits) Non-fast-forward update to branch wip/chergert/macos-iosurface

[Christian Hergert <chergert src gnome org>]

The branch 'wip/chergert/macos-iosurface' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  4c21cce... macos: use CALayer and IOSurface for rendering
  5e012aa... remove dead code
  02a5f49... clear things as we go
  3e70269... doesnt really matter, but fine to be sure whats going on
  07586da... use private API that isn't really private
  b578c65... dont use setOpaque override anymore
  8201be5... avoid nil/buffer set hack
  ec346ee... more tweaks
  07df32e... add note about needs display
  6d5bc92... macos: improve position and size during unmaximize
  43c186f... macos: try to blend in better with layout system
  2b3fe6a... macos: no need to redisplay contents
  12e0bbf... remove yes from these too

Commits added to the branch:

  92274f9... macos: use CALayer and IOSurface for rendering
  38b9dab... macos: improve position and size during unmaximize
  1d93fe5... macos: avoid redisplay when changing frame
  d3b0323... macos: delay window resize until compute-size