Please describe the problem:
The problem seems to be that gtk_tooltip_finalize is run too late in the gdk_display_close process and gtk_widget_get_display on tooltip->window fails.


Steps to reproduce:
1. hover the mouse over the window (runs _gtk_tooltip_handle_event)
2. gtk_main_quit
3. gdk_display_close


Actual results:
Several warnings are emitted.  The first of which are:

(a.out:30780): Gdk-CRITICAL **: gdk_screen_get_display: assertion `GDK_IS_SCREEN (screen)' failed

(a.out:30780): GLib-GObject-WARNING **: invalid (NULL) pointer instance

(a.out:30780): GLib-GObject-CRITICAL **: g_signal_handlers_disconnect_matched: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

(a.out:30780): GLib-GObject-CRITICAL **: g_object_ref: assertion `G_IS_OBJECT (object)' failed

The rest are similar.

Expected results:
No warnings.

Does this happen every time?
Yes.

Other information: