+static void
+on_owner_change (GtkClipboard *clip, GdkEventOwnerChange *event, gpointer data)
+{
+ gint i;
+ gboolean compatible_target = FALSE;
+ PsppireSyntaxWindow *sw = PSPPIRE_SYNTAX_WINDOW (data);
+
+ for (i = 0 ; i < sizeof (targets) / sizeof (targets[0]) ; ++i)
+ {
+ GdkAtom atom = gdk_atom_intern (targets[i].target, TRUE);
+ if ( gtk_clipboard_wait_is_target_available (clip, atom))
+ {
+ compatible_target = TRUE;
+ break;
+ }
+ }
+
+ gtk_action_set_sensitive (sw->edit_paste, compatible_target);
+}
+