[gtk+/quartz-integration] Force a pasteboard changeOwner notification when a widget with an active selection is deleted.

[John Ralls <jralls src gnome org>]

commit 9493ce2ab215fb2f0a8dd637c95e29e6e9fd184a
Author: John Ralls <jralls ceridwen us>
Date:   Fri Dec 31 17:12:31 2010 -0800

    Force a pasteboard changeOwner notification when a widget with an active selection is deleted.

 gtk/gtkselection-quartz.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkselection-quartz.c b/gtk/gtkselection-quartz.c
index f7b4654..6f97693 100644
--- a/gtk/gtkselection-quartz.c
+++ b/gtk/gtkselection-quartz.c
@@ -562,6 +562,12 @@ gtk_selection_info_remove (GdkAtom selection, GtkWidget *owner)
       if (selection_info->selection == selection &&
 	  selection_info->owner == owner)
 	{
+	  /* Clear the clipboard; this will send a changedOwner to the
+	     pasteboard so that it won't try to retrieve the
+	     still-pending types later when the window isn't around to
+	     provide them. */
+	  GtkClipboard *clip = gtk_clipboard_get(selection_info->selection);
+	  gtk_clipboard_clear(clip);
 	  current_selections = g_list_remove_link (current_selections,
 						   tmp_list);
 	  g_list_free (tmp_list);