[gtk] (37 commits) ...Merge branch 'wip/matthiasc/focus3' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  92f1bdc... Redo focus handling (*)
  ab5d3e7... root: Add focus (*)
  bd44831... window: Implement the root focus api (*)
  2bf1561... Port widgets to the root focus API (*)
  029ec38... Move a check to gtk_window_set_focus (*)
  2738926... Simplify the move_focus api (*)
  8c1d852... widget: Drop the ::focus signal (*)
  94b0e99... Exclude non-drawable widgets from focus (*)
  15300f8... widget: Add a private setter for has-focus (*)
  7819a5a... Drop gtk_widget_send_focus_change (*)
  d279c66... inspector: Stop using ::set-focus (*)
  f13e617... filechooser: Stop using ::set-focus (*)
  31d9ecb... popover: Stop using ::set-focus (*)
  f688553... window: Remove ::set-focus (*)
  7ca24f1... window: Remove initial-focus builder support (*)
  a3abf06... Clarify grab_focus docs (*)
  8d5f1ae... gdk: Add crossing mode and detail to focus events (*)
  c73972f... gdk: Rename gdk_event_set_user_data (*)
  06f790d... gdk: Add a related_target field to some events (*)
  cdcd2bb... Share crossing and focus change event code (*)
  adb547a... Export gtk_synthesize_crossing_events internally (*)
  4238a04... window: Use gtk_synthesize_crossing_events (*)
  7d354b5... Some fixes to crossing event generation (*)
  888b926... Move maintaining the focus chain (*)
  921eccb... Pass mode and detail to focus-in/out signals (*)
  2f1194c... key controller: Fix a copy/paste error (*)
  4f5a820... key controller: Add focus properties (*)
  f3ed3e9... key controller: Add getters for focus event targets (*)
  4f06b66... key controller: Improve the docs (*)
  93905a8... key controller: Enforce limitations of key forwarding (*)
  181a4bc... Add key controller API to the docs (*)
  492a38c... Make gtk_widget_get_focus_child public (*)
  6ddb611... Use root in gdk_synthesize_crossing_events (*)
  8619b10... Update the focus test (*)
  ad3773b... a11y tests: Update expected results (*)
  1ce5327... xim: Stop using GtkWidget::event (*)
  fc2b412... Merge branch 'wip/matthiasc/focus3' into 'master'

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