[gnome-2048] (36 commits) Non-fast-forward update to branch arnaudb/wip/gtk4

[Arnaud B. <arnaudb src gnome org>]

The branch 'arnaudb/wip/gtk4' 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:

  b637056... Compile with Gtk4.
  63d5961... Drop Clutter dependency.
  5711f2e... Remove Clutter.
  c0f7a17... No more Geometry.
  f02dd76... Make on_window_state_event work.
  c963c9b... No need to set events.
  6ca3e1c... Use hide-on-close property.
  72ff68c... Adapt event controllers.
  c42438a... Adapt size_allocate() method.
  eb89b23... Waiting for a Gtk fix.
  3226d0f... Adapt to RGBA.
  cc76cfb... Fix a return type.
  ed421aa... Add PangoCairo dependency.
  211a0d2... Uncomment some things.
  971c297... Comment something.
  60d028c... Try a fix.
  8af94c3... Uncomment more stuff.
  5e43089... Comment more stuff.
  0b0043d... Adapt UI files.
  44b4b87... Comment a thing.
  1cd49ec... HeaderBar is not subclassable anymore.
  d3fbb11... Clean UI file.
  6d909e1... Fix UI file.
  b62c9d0... Improve UI file.
  6597267... Make things start to look promising.
  7da51ed... Test.
  27ddba3... Do not use headerbar subtitle.
  123fd67... Adapt to AspectFrame API.
  b0f90be... Adapt to Overlay API.
  7db1603... Comment things.
  98dce47... Comment some other things.
  b9a9102... Comment things.
  464bffc... Adapt to HeaderBar API.
  ab460e5... Fix Keyboard Shortcuts order.

Commits added to the branch:

  f892e9a... Use a const variable. (*)
  e847280... Compile with Gtk4.
  4a3dd87... Drop Clutter dependency.
  a4c6483... Remove Clutter.
  8d4361a... No more Geometry.
  b427cc3... Make on_window_state_event work.
  0cc1c65... Fix size_allocate stuff.
  7f90f88... No need to set events.
  f190b3d... Use hide-on-close property.
  3d68c94... Adapt event controllers.
  4983feb... Adapt to RGBA.
  c81a2ce... Fix a return type.
  5aa5c16... Add PangoCairo dependency.
  fb3ad58... Uncomment some things.
  1703245... Comment something.
  21a95f0... Try a fix.
  db2c18e... Uncomment more stuff.
  0714451... Comment more stuff.
  97a660c... Adapt UI files.
  2a5bfc2... Waiting for a Gtk fix.
  a8dbd07... Comment a thing.
  fead7d0... HeaderBar is not subclassable anymore.
  cb2463b... Clean UI file.
  b4ea2c9... Fix UI file.
  b1cae8e... Improve UI file.
  ed7fb2c... Make things start to look promising.
  c9c7eff... Test.
  5037c35... Do not use headerbar subtitle.
  b6351ab... Adapt to AspectFrame API.
  e50b4f7... Adapt to Overlay API.
  5530489... Comment things.
  23a6a12... Comment some other things.
  a70de50... Comment things.
  23af560... Adapt to HeaderBar API.
  cb2a920... Fix Keyboard Shortcuts order.
  0d2aad0... Try to fix CI.

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