[gtk] (30 commits) ...Merge branch 'wip/matthiasc/can-focus' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  b86c144... notbook: Fix a bug in focus handling (*)
  a3861bf... Fix running focus-chain tests in ci (*)
  ff8217d... Add more focus chain tests (*)
  a65fd81... root: Reorganize focus handling (*)
  2a18f21... window: Make set_focus equal to grab_focus (*)
  7ca36cd... Stop setting can-focus in ui files (*)
  f996ba6... inspector: Remove can-focus from ui files (*)
  b3b29e3... inspector: Drop more uses of can-focus (*)
  bbd4fb8... testsuite: Stop using can-focus (*)
  b1afe5f... a11y tests: Stop using can-focus (*)
  4fe8c03... reftests: Stop using can-focus (*)
  c1459cc... widget: Drop the :is-focus property (*)
  9416856... testsuite: Stop setting :has-focus (*)
  97ff1b8... widget: Make the :has-focus property readonly (*)
  46ff9f8... gizmo: Allow passing changing focus behavior (*)
  3c39613... widget: Add common focus vfunc implementations (*)
  22e1827... Change the default value of GtkWidget:can-focus (*)
  632524f... Reinstate expected focus behavior (*)
  6f01508... Fix up focus chain result (*)
  6720552... Remove the focus test (*)
  99eed07... Remove focusable-container tests (*)
  2ae08e6... color editor: Make the sample non-focusable again (*)
  038190c... Disable focus-chain test that depends on the environment (*)
  b9a76dd... Fix the tools tests to not set can-focus (*)
  508cb61... a11y: Fix focusable state (*)
  35ba24d... Update a11y test results (*)
  72ae6da... Move focus to the parent if a popover is dismissed (*)
  16c820c... Small documentation tweaks (*)
  f16c829... Mention focus changes in the migration guide (*)
  a11f9fe... Merge branch 'wip/matthiasc/can-focus' into 'master'

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