[gtk] (8 commits) Non-fast-forward update to branch clipboard-test

[Matthias Clasen <matthiasc src gnome org>]

The branch 'clipboard-test' 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:

  0e52278... Add more clipboard tests
  1db9990... Compare images as pixels
  9971892... Fix clipboard tests

Commits added to the branch:

  1635998... gtkplacessidebar.c: add bookmark null checking (*)
  2a61026... gdk/wayland/cursor/os-compatibility: fix build when memfd_c (*)
  2938236... docs: Add missing extra files for gdk4 sub-references (*)
  e637ed7... Merge branch 'memfd_create' into 'master' (*)
  ac5f0ba... Merge branch 'ebassi/issue-3905' into 'master' (*)
  65575fe... gtkplacessidebar.c: fix coding style (*)
  604d171... Merge branch 'bookmark-fix' into 'master' (*)
  be42644... Add more clipboard tests

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