[gtk+] (14 commits) Non-fast-forward update to branch wip/ebassi/gsk-1

[Emmanuele Bassi <ebassi src gnome org>]

The branch 'wip/ebassi/gsk-1' 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:

  9150ee2... gsk: Initial commit / build environment
  ea582b4... Snapshot/WIP

Commits added to the branch:

  a9f94ba... Updated Lithuanian translation (*)
  aeed695... gtkapplication: _get_app_menu can return NULL (*)
  a91237d... window: Remove suspicious branch (*)
  6f2d5a6... Move autotestkeywords to testsuite (*)
  785a425... Add tests for seat apis (*)
  669336c... Expand visual tests a bit (*)
  43a5683... Add some tests for GdkRectangle (*)
  e7cd3dd... Adwaita: cosmetic fix (*)
  38f9419... Adwaita: set caret-color for drop targets (*)
  cea8c29... GDK W32: Implement show_window_menu() (*)
  77eebbd... GDK W32: Erase hidden layered windows before showing them (*)
  6267b6b... Bump to 3.21.0 (*)
  2e42e83... gsk: Initial commit / build environment
  54230de... Snapshot/WIP

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