[gtk/matthiasc/for-master] (19 commits) ...testsuite: Add a builder test for shortcut controllers

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  61e88c7... Merge branch 'matthiasc/for-master' into 'master' (*)
  e9082fd... widget-factory: avoid the T word (*)
  da47cca... Merge branch 'wip/jimmac/avoid-t-word' into 'master' (*)
  3e1f59a... gdk: Add gdk_toplevel_inhibit_system_shortcuts API (*)
  a07a69e... gdk: add internal `gdk_surface_get_seat_from_event()` (*)
  5ac73be... wayland: Use a GdkSeat as key for our internal hash table (*)
  36d986f... wayland: Implement inhibit_system_shortcuts API (*)
  44931a6... x11: Use gdk_x11_* rather than gdk_wayland_* (*)
  83027c6... x11: Implement inhibit_system_shortcuts API (*)
  b22c7b8... broadway: Add inhibit shortcut properties (*)
  c3ff175... win32: Add inhibit shortcut properties (*)
  bd55c58... colorpickerportal: Simplify version fetching code (*)
  027ca22... Add portal version checking helper (*)
  8cf41c1... filechoosernativeportal: Fall back if portal is too old (*)
  96f0c26... Merge branch 'issue982' into 'master' (*)
  2a3dab5... Merge branch 'wip/hadess/portal-fixes' into 'master' (*)
  5bf0304... Add new api to the docs (*)
  ace183f... shortcutcontroller: Fix builder support
  e9cb4be... testsuite: Add a builder test for shortcut controllers

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