[gtk] (5 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:

  521aff4... container: Stop remove()ing all widgets in dispose
  3d4d6f7... demo: Fix modelbutton demo
  e77601b... demo: Don't manually add labels to menubuttons
  9594db0... fixed: Implement dispose()
  8441877... sdf
  c4c9858... Revert "container: Stop remove()ing all widgets in dispose"

Commits added to the branch:

  3f36124... demo: Fix modelbutton demo
  2022529... demo: Don't manually add labels to menubuttons
  f6b576e... fixed: Implement dispose()
  8fc62cd... sdf
  5a0c97c... fo