[gtk] (6 commits) Non-fast-forward update to branch wip/baedert/for-master

[Timm Bäder <baedert src gnome org>]

The branch 'wip/baedert/for-master' 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:

  a8e9df7... gl: Adjust blur radius_multiplier
  18627fc... testoutsetshadowdrawing: Make window background white
  516959e... gl renderer: Adjust gaussian blur sigma
  47cf3af... wayland: Fix a GSettingsSchema leak
  28fb707... rendernodes: Whitespace
  e5258f4... Change button hierarchy

Commits added to the branch:

  2bff84c... gl: Adjust blur radius_multiplier
  7a8d711... testoutsetshadowdrawing: Make window background white
  c1c2205... gl renderer: Adjust gaussian blur sigma
  b0d89b1... wayland: Fix a GSettingsSchema leak
  51b398b... rendernodes: Whitespace
  1375fb4... Change button hierarchy