[gtk] (4 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:

  952df96... stack: Apply transitions in size-allocate
  4d48fa0... Revert "stack: Apply transitions in size-allocate"
  8df524f... stack: stop keeping a cached child render node around
  ce6f4b4... transform: Fix docs to use "transform" instead of "matrix"
  38e9947... treeview: Remove identical if branches
  e22c6bd... widget: Don't leak css transform

Commits added to the branch:

  8bf74d3... stack: stop keeping a cached child render node around
  4f6880b... transform: Fix docs to use "transform" instead of "matrix"
  dc73cc8... treeview: Remove identical if branches
  2e63118... widget: Don't leak css transform