[gtk+] (6 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:

  348faf2... gtk: Stop using gtk_widget_destroy
  19673b1... GdkEvent: Unref user_data in free
  54cf193... Stop using gtk_widget_destroy everywhere
  982493a... widget: Remove gtk_widget_destroy
  c408153... testsuite: add widget refcount test case
  173c776... build: Add missing action-namespace example

Commits added to the branch:

  c3721fc... gtk: Stop using gtk_widget_destroy
  3a97127... GdkEvent: Unref user_data in free
  d71c7e8... Stop using gtk_widget_destroy everywhere
  146275b... widget: Remove gtk_widget_destroy
  a50eca6... testsuite: add widget refcount test case
  062eded... build: Add missing action-namespace example