[gnome-shell] (10 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:

  76e7904... extensions-app: Don't keep ref to main window
  6320dcc... extensions-app: Clean up when window is unrealized
  49852ce... dbusServices/extensions: Minor cleanup
  070c10b... dbusServices/extensions: Set title on window instead of hea
  91a8fb1... dbusServices/extensions: Use consistent style for property 
  3c5822c... dbusServices/extensions: Stop using :margin shortcut
  411c32c... dbusServices/extensions: Stop using GtkContainer API
  faf2b2f... dbusServices/extensions: Stop using GtkToolbar
  5aa3fda... dbusServices/extensions: Stop stacking frames
  0372387... dbusServices/extensions: Remove event box
  9afc536... Port extensions app and portal to GTK4

Commits added to the branch:

  b21c0d9... extensions-app: Explicitly dispose window when removed
  b1be6f2... dbusServices/extensions: Minor cleanup
  53546d9... dbusServices/extensions: Set title on window instead of hea
  9c51f1b... dbusServices/extensions: Use consistent style for property 
  76a2e93... dbusServices/extensions: Stop using :margin shortcut
  da87fd2... dbusServices/extensions: Stop using GtkContainer API
  cb3d12e... dbusServices/extensions: Stop using GtkToolbar
  e112073... dbusServices/extensions: Stop stacking frames
  132b4a7... dbusServices/extensions: Remove event box
  c3bec32... Port extensions app and portal to GTK4