[gnome-control-center] display: don't allow setting primary on off displays

[William Jon McCann <mccann src gnome org>]

commit 3f054a856e474319eb30008868bef8a523efd467
Author: William Jon McCann <jmccann redhat com>
Date:   Mon Nov 22 21:54:51 2010 -0500

    display: don't allow setting primary on off displays

 panels/display/xrandr-capplet.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/panels/display/xrandr-capplet.c b/panels/display/xrandr-capplet.c
index 8e4813a..5cbd426 100644
--- a/panels/display/xrandr-capplet.c
+++ b/panels/display/xrandr-capplet.c
@@ -1569,7 +1569,8 @@ on_output_event (FooScrollArea *area,
 
   if (event->type == FOO_DRAG_HOVER)
     {
-      set_primary_output (app, output);
+      if (output->on)
+        set_primary_output (app, output);
       return;
     }