[gtk] (18 commits) Non-fast-forward update to branch window-destroy

[Matthias Clasen <matthiasc src gnome org>]

The branch 'window-destroy' 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:

  277df04... Stop using gtk_widget_destroyed
  0bb364e... Drop gtk_widget_destroyed
  4f3c299... fontchooserdialog: Fix disposing
  6fec92b... colorchooserdialog: Fix disposing
  b7bb01d... filechooserdialog: Fix disposing
  c831423... popover: Fix a reference leak
  3b77788... testsuite: Clean up unexpected children
  bacae13... nativedialog: Do not ref the transient_for parent
  69b5b52... window: Add gtk_window_destroy
  11470e2... Use gtk_window_destroy
  da68195... Replace gtk_widget_destroy everywhere
  6820749... window: Implement gtk_window_destroy
  0be9fd5... widget: Drop gtk_widget_destroy
  2e4b1e3... testsuite: add widget refcount test case
  887cb42... window: Remove _set_has_user_ref_count
  25a8b7b... Unset tooltip window earlier
  ed985a6... Update the docs

Commits added to the branch:

  5976655... Merge branch 'teardown-cleanup-2' into 'master' (*)
  99c9361... Stop using gtk_widget_destroyed
  2139f58... Drop gtk_widget_destroyed
  c8278f2... fontchooserdialog: Fix disposing
  46d9170... colorchooserdialog: Fix disposing
  250f964... filechooserdialog: Fix disposing
  1a3184e... popover: Fix a reference leak
  4f1df23... testsuite: Clean up unexpected children
  fdd8497... nativedialog: Do not ref the transient_for parent
  c644b78... window: Add gtk_window_destroy
  72ddb2c... Use gtk_window_destroy
  073f0a8... Replace gtk_widget_destroy everywhere
  1c8008d... window: Implement gtk_window_destroy
  3970535... widget: Drop gtk_widget_destroy
  229a599... testsuite: add widget refcount test case
  50d8742... window: Remove _set_has_user_ref_count
  d759072... Unset tooltip window earlier
  365838f... Update the docs

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