Reworking of Arjan Molenaar's (arjanmolenaar@hetnet.nl) patch from bugPYGTK_1_99_11

2002-07-09  James Henstridge  <james@daa.com.au>

	Reworking of Arjan Molenaar's (arjanmolenaar@hetnet.nl) patch from
	bug 71435.

	* gtk/libglade.override (connect_one): watch the closure.
	(connect_many): watch the closure.

	* gtk/gtk.override (_wrap_gtk_toolbar_append_item): watch closure
	for signal.
	(_wrap_gtk_toolbar_prepend_item): same here.
	(_wrap_gtk_toolbar_insert_item): same here.
	(_wrap_gtk_toolbar_insert_stock): same here.
	(_wrap_gtk_toolbar_append_element): same here.
	(_wrap_gtk_toolbar_prepend_element): same here.
	(_wrap_gtk_toolbar_insert_element): same here.

	* pygobject.h (_PyGObject_Functions): add pygobject_watch_closure
	to the list of exported functions.

	* pygobject.c (pygobject_watch_closure): new function to watch a
	closure.  We perform cyclic garbage collection on watched
	closures.  The closure will automatically be unwatched when it
	gets invalidated.
	(pygobject_traverse): traverse watched closures as well.
	(pygobject_clear): invalidate all watched closures
	(pygobject_dealloc): invalidate watched closures on dealloc too.
	(PyGObject_Type): register the invalidate handler.
	(pygobject_connect): watch the closure we connect here.
	(pygobject_connect_after): same here..
	(pygobject_connect_object): same here.
	(pygobject_connect_object_after): same here.

	* pygtype.c (pyg_closure_new): clean up closure on invalidate,
	rather than finalize (on invalidate, we break references).

	* pygobject.h (PyGObject): add closures member to store references
	to PyGClosures.

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