[gtk] (13 commits) Non-fast-forward update to branch matthiasc/for-master

[Matthias Clasen <matthiasc src gnome org>]

The branch 'matthiasc/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:

  84d4816... build: Start using meson feature options

Commits added to the branch:

  8eb807d... entrycompletion: Remove unnecessary frame (*)
  1948f8a... placessidebar: Remove unused frame (*)
  6a7a0f0... viewport: Remove unused frame (*)
  5822cdb... Update POTFILES.in and POTFILES.skip (*)
  bc132da... Update Polish translation (*)
  4fefea7... Update Indonesian translation (*)
  4eacfdb... Merge branch 'remove-unnecessary-frames' into 'master' (*)
  a498aca... Adwaita: error labels insensitive & backdrop states (*)
  420c4e1... Update Ukrainian translation (*)
  ff5cdba... Update Chinese (China) translation (*)
  85764ce... Update Turkish translation (*)
  14c8c04... Fix a leak in the font chooser widget
  8c3d5eb... build: Start using meson feature options

(*) This commit already existed in another branch; no separate mail sent