a11y: Mark cells as defunct when deleting them

Just unreffing isn't enough, atk-bridge might have a reference to the
object still.

diff --git a/gtk/a11y/gtktreeviewaccessible.c b/gtk/a11y/gtktreeviewaccessible.c
index 2807e4158d4cdfa7078e1992f52e7ef201503c3b..8bec29102bb024ef542434356057805f14c866f7 100644 (file)
--- a/gtk/a11y/gtktreeviewaccessible.c
+++ b/gtk/a11y/gtktreeviewaccessible.c
@@ -97,6 +97,7 @@ gtk_tree_view_accessible_get_data_quark (void)
 static void
 cell_info_free (GtkTreeViewAccessibleCellInfo *cell_info)
 {
+  gtk_accessible_set_widget (GTK_ACCESSIBLE (cell_info->cell), NULL);
   g_object_unref (cell_info->cell);
 
   g_free (cell_info);