[gtk] (4 commits) Non-fast-forward update to branch readonly-all-the-things

[Matthias Clasen <matthiasc src gnome org>]

The branch 'readonly-all-the-things' 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:

  537b7ca... Revert "Cache glyph textures in render nodes"
  b90801e... gl: Add some comments
  ee8c30a... gl: Avoid pointless iteration
  b4161e5... Revert "gl: Speed up icon cache lookups"

Commits added to the branch:

  1038bc7... Revert "Cache glyph textures in render nodes"
  dd316c8... gl: Add some comments
  472d8ee... gl: Avoid pointless iteration
  5b508ea... Revert "gl: Speed up icon cache lookups"