[gtk+] (8 commits) Non-fast-forward update to branch wip/baedert/gtk-widget-destroy

[Timm Bäder <baedert src gnome org>]

The branch 'wip/baedert/gtk-widget-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:

  03f37c8... gtk: Stop using gtk_widget_destroy
  852ad8e... GdkEvent: Unref user_data in free
  12775c7... Stop using gtk_widget_destroy everywhere
  7f417a4... widget: Remove gtk_widget_destroy
  905c054... testsuite: add widget refcount test case
  7ee0ce1... build: Add missing action-namespace example
  59ad45c... testdnd2: Adapt to widget changes
  be1a549... GdkEvent: OWNER_CHANGE events have a selection as well

Commits added to the branch:

  1ce3422... gtk: Stop using gtk_widget_destroy
  912fcda... GdkEvent: Unref user_data in free
  a9644ea... Stop using gtk_widget_destroy everywhere
  f56067c... widget: Remove gtk_widget_destroy
  6cc2040... testsuite: add widget refcount test case
  823e6ec... build: Add missing action-namespace example
  e1e148f... testdnd2: Adapt to widget changes
  7bddf3c... GdkEvent: OWNER_CHANGE events have a selection as well