[banshee] StreamPositionLabel: Avoid unnecessary redraws (bgo#647144)

[Gabriel Burt <gburt src gnome org>]

commit 97eda7ffed4f7402b2966bfd7ee4ae000f9247f2
Author: Gabriel Burt <gabriel burt gmail com>
Date:   Fri Apr 8 11:42:36 2011 -0500

    StreamPositionLabel: Avoid unnecessary redraws (bgo#647144)
    
    Ignore attempts to set the label to its current value.

 .../Banshee.Widgets/StreamPositionLabel.cs         |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/src/Core/Banshee.Widgets/Banshee.Widgets/StreamPositionLabel.cs b/src/Core/Banshee.Widgets/Banshee.Widgets/StreamPositionLabel.cs
index fdb1293..a31a21c 100644
--- a/src/Core/Banshee.Widgets/Banshee.Widgets/StreamPositionLabel.cs
+++ b/src/Core/Banshee.Widgets/Banshee.Widgets/StreamPositionLabel.cs
@@ -174,12 +174,14 @@ namespace Banshee.Widgets
             }
         }
 
+        private string last_text;
         private void UpdateLabel (string text)
         {
-            if (!IsRealized || layout == null) {
+            if (!IsRealized || layout == null || text == last_text) {
                 return;
             }
 
+            last_text = text;
             layout.SetMarkup (String.Format (format_string, GLib.Markup.EscapeText (text)));
             QueueResize ();
         }