[gnome-screensaver] Revert "Revert "window: only show panel on primary head""

[Ray Strode <halfline src gnome org>]

commit 1f5e35e3b883fb76bf5e922e46e40b6a67d3919d
Author: Ray Strode <rstrode redhat com>
Date:   Tue Jul 17 15:12:57 2012 -0400

    Revert "Revert "window: only show panel on primary head""
    
    This reverts commit 0d534a922edd536223d6363a59d990ec288d6526.
    
    Yo dawg, I heard you like reverts, so i'm reverting the revert,
    so you can revert while you revert.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=679441

 src/gs-window-x11.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/src/gs-window-x11.c b/src/gs-window-x11.c
index 268194c..c278612 100644
--- a/src/gs-window-x11.c
+++ b/src/gs-window-x11.c
@@ -332,6 +332,9 @@ gs_window_move_resize_window (GSWindow *window,
                               gboolean  resize)
 {
         GtkWidget *widget;
+        GdkScreen *screen;
+        int        monitor;
+        int        primary_monitor;
 
         widget = GTK_WIDGET (window);
 
@@ -359,6 +362,12 @@ gs_window_move_resize_window (GSWindow *window,
                                    window->priv->geometry.width,
                                    window->priv->geometry.height);
         }
+
+        screen = gtk_widget_get_screen (widget);
+        monitor = gdk_screen_get_monitor_at_window (screen,
+                                                    gtk_widget_get_window (widget));
+        primary_monitor = gdk_screen_get_primary_monitor (screen);
+        gtk_widget_set_visible (window->priv->panel, monitor == primary_monitor);
 }
 
 static void