[gnome-shell] (19 commits) Non-fast-forward update to branch wip/fmuellner/gtk4

[Florian Müllner <fmuellner src gnome org>]

The branch 'wip/fmuellner/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:

  98c553f... shew: Use Xlib to set transient hint
  bb348c9... extensions-app: Remove stray angle brackets
  dd12838... extensions-app: Set title on window instead of headerbar
  99b5fa8... extensions-app: Use consistent style for property names
  c741d23... extensions-app: Don't use deprecated margin-left/right prop
  a2b9e90... extensions-app: Stop using :margin shortcut
  de3e913... extensions-app: Don't keep ref to main window
  992f729... extensions-app: Clean up when window is unrealized
  e41b34a... dbusServices/extensions: Minor cleanup
  fc35d9e... dbusServices/extensions: Set title on window instead of hea
  6892264... dbusServices/extensions: Use consistent style for property 
  9619d82... dbusServices/extensions: Stop using :margin shortcut
  3de1d00... dbusServices/extensions: Stop using GtkContainer API
  e9bdd45... dbusServices/extensions: Stop using GtkToolbar
  83cc52b... dbusServices/extensions: Stop stacking frames
  4b1a1b8... dbusServices/extensions: Remove event box
  7108a74... Port extensions app and portal to GTK4

Commits added to the branch:

  b64020f... ci: Set some sensible defaults (*)
  07fd0d3... ci: Replace only/except with rules (*)
  0671fb1... shew: Use Xlib to set transient hint
  4e4210d... extensions-app: Remove stray angle brackets
  d617a7a... extensions-app: Set title on window instead of headerbar
  223c568... extensions-app: Use consistent style for property names
  3427c3d... extensions-app: Don't use deprecated margin-left/right prop
  d788952... extensions-app: Stop using :margin shortcut
  15e7611... extensions-app: Don't keep ref to main window
  3300a94... extensions-app: Clean up when window is unrealized
  9391fe4... dbusServices/extensions: Minor cleanup
  cfdc693... dbusServices/extensions: Set title on window instead of hea
  ae630ce... dbusServices/extensions: Use consistent style for property 
  63e7122... dbusServices/extensions: Stop using :margin shortcut
  5dd1bc1... dbusServices/extensions: Stop using GtkContainer API
  06682a1... dbusServices/extensions: Stop using GtkToolbar
  00d872a... dbusServices/extensions: Stop stacking frames
  bda9713... dbusServices/extensions: Remove event box
  d69607e... Port extensions app and portal to GTK4

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