[gtk] (19 commits) Non-fast-forward update to branch wip/baedert/for-master

[Timm Bäder <baedert src gnome org>]

The branch 'wip/baedert/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:

  689516e... gtk4-demo: Add background to CSS Basics demo
  ff57e0d... gl: Adjust blur radius_multiplier
  7fb30a8... gsk: Fix border node diff implementation
  86d46c2... testadjustsize: Fix overlay/box confusion
  edbfe9e... button: Whitespace
  1b53668... button: Use gtk_widget_class_add_shortcut directly
  7a26406... spinbutton: Whitespace
  93abe04... gdkcairoprivate: Fix header guard
  2094ff1... icon-browser: Add .navigation-sidebar to sidebar
  9118faa... WIP: Change button hierarchy

Commits added to the branch:

  dd0c43b... Don't export gdk_surface_constrain_size (*)
  74f8c59... Merge branch 'matthiasc/for-master' into 'master' (*)
  e4215ec... bookmarksmanager: Cancel async reads properly (*)
  564ae4b... Merge branch 'matthiasc/for-master' into 'master' (*)
  78134fc... Add a function to request motion events (*)
  1a39ac6... Update Catalan translation (*)
  5b5d266... idle sizer: Request a motion event after layout (*)
  5533494... Merge branch 'synthetic-motion' into 'master' (*)
  f6adba5... NEWS: Updates (*)
  620388a... gtk4-demo: Add background to CSS Basics demo
  cb9a295... gl: Adjust blur radius_multiplier
  fbcf45c... gsk: Fix border node diff implementation
  588a674... testadjustsize: Fix overlay/box confusion
  11e2aa6... button: Whitespace
  5b5df6b... button: Use gtk_widget_class_add_shortcut directly
  45a51b7... spinbutton: Whitespace
  9777e73... gdkcairoprivate: Fix header guard
  93b54ca... icon-browser: Add .navigation-sidebar to sidebar
  d1bf84c... WIP: Change button hierarchy

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