[gtk] (7 commits) ...Merge branch 'wip/chergert/for-macos-1' into 'main'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  056e901... macos: improve monitor detection at display coordinates (*)
  d58c038... macos: remove assertion from external API (*)
  8f0b9bf... macos: fix incorrect signal disconnect (*)
  a080f11... macos: ignore mouse events outside tracking area (*)
  f207402... macos: use input_region to specify tracking areas (*)
  3c9687f... macos: add helper to check if surface is opaque (*)
  9c1a665... Merge branch 'wip/chergert/for-macos-1' into 'main'

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