[gtk+] (5 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:

  6b305af... clipboard: Make sure we got a selection
  a044f06... gtk: Stop using gtk_widget_destroy
  f62a941... GdkEvent: Unref user_data in free
  53bb418... testpopover: Explicitly destroy window
  76f1ec7... gtkswitch: Explicitly destroy toplevel
  59929a1... Stop using gtk_widget_destory everywhere
  e90f04d... widget: Remove gtk_widget_destroy
  7ddd65b... dnd: Ref the icon widget

Commits added to the branch:

  348faf2... gtk: Stop using gtk_widget_destroy
  15f69ec... GdkEvent: Unref user_data in free
  16a12ba... Stop using gtk_widget_destroy everywhere
  7394d27... widget: Remove gtk_widget_destroy
  809e4cd... testsuite: add widget refcount test case