[banshee/stable-1.6] [BansheeDialog] center on screen if parent hidden

[Aaron Bockover <abock src gnome org>]

commit 171cbf5b9737fd39bda835bf2a5fc13d31f4001c
Author: Aaron Bockover <abockover novell com>
Date:   Mon Apr 5 11:52:35 2010 -0400

    [BansheeDialog] center on screen if parent hidden
    
    If the transient dialog is null or is not visible, center
    the dialog on the screen, otherwise it will end up in an
    unspecified location.

 .../Banshee.Gui.Dialogs/BansheeDialog.cs           |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/src/Core/Banshee.ThickClient/Banshee.Gui.Dialogs/BansheeDialog.cs b/src/Core/Banshee.ThickClient/Banshee.Gui.Dialogs/BansheeDialog.cs
index 97e055c..d7912c2 100644
--- a/src/Core/Banshee.ThickClient/Banshee.Gui.Dialogs/BansheeDialog.cs
+++ b/src/Core/Banshee.ThickClient/Banshee.Gui.Dialogs/BansheeDialog.cs
@@ -65,7 +65,9 @@ namespace Banshee.Gui.Dialogs
                 TransientFor = parent;
             }
 
-            WindowPosition = WindowPosition.CenterOnParent;
+            WindowPosition = TransientFor == null || !TransientFor.Visible
+                ? WindowPosition.Center
+                : WindowPosition.CenterOnParent;
             DestroyWithParent = true;
 
             accel_group = new AccelGroup ();