Modified to only update format map if it needs to be, to prevent unne…

…cessary changes and conflicts with other extensions that change format maps. Bumped version to 1.2.

ViewCreationListener.cs

@@ -23,7 +23,8 @@ internal sealed class ViewCreationListener : IWpfTextViewCreationListener
         /// </summary>
         public void TextViewCreated(IWpfTextView textView)
         {
-            new FormatMapWatcher(textView, formatMapService.GetEditorFormatMap(textView));
+            textView.Properties.GetOrCreateSingletonProperty(() => 
+                     new FormatMapWatcher(textView, formatMapService.GetEditorFormatMap(textView)));
         }
     }
 
@@ -99,22 +100,44 @@ void SetGradientBrush()
         {
             // Change the selected text properties to use a gradient brush and an outline pen
             var properties = formatMap.GetProperties("Selected Text");
-            properties[EditorFormatDefinition.BackgroundBrushId] = gradientBrush;
-            properties["BackgroundPen"] = gradientBorder;
-            formatMap.SetProperties("Selected Text", properties);
+
+            bool modified = false;
+
+            if (properties[EditorFormatDefinition.BackgroundBrushId] != gradientBrush)
+            {
+                modified = true;
+                properties[EditorFormatDefinition.BackgroundBrushId] = gradientBrush;
+            }
+            if (properties["BackgroundPen"] != gradientBorder)
+            {
+                modified = true;
+                properties["BackgroundPen"] = gradientBorder;
+            }
+
+            if (modified)
+                formatMap.SetProperties("Selected Text", properties);
         }
 
         void ClearGradientBrush()
         {
             // Clear out the gradient brush and outline pen
             var properties = formatMap.GetProperties("Selected Text");
 
+            bool modified = false;
+
             if (properties[EditorFormatDefinition.BackgroundBrushId] == gradientBrush)
+            {
+                modified = true;
                 properties.Remove(EditorFormatDefinition.BackgroundBrushId);
+            }
             if (properties["BackgroundPen"] == gradientBorder)
+            {
+                modified = true;
                 properties.Remove("BackgroundPen");
+            }
 
-            formatMap.SetProperties("Selected Text", properties);
+            if (modified)
+                formatMap.SetProperties("Selected Text", properties);
         }
     }
 }

source.extension.vsixmanifest

@@ -3,7 +3,7 @@
     <Identifier Id="GradientSelection">
         <Name>Gradient Selection</Name>
         <Author>Noah Richards</Author>
-        <Version>1.1</Version>
+        <Version>1.2</Version>
         <Description>Make the selection use a gradient brush in rich client experience mode.</Description>
         <Locale>1033</Locale>
         <MoreInfoUrl>http://blogs.msdn.com/noahric</MoreInfoUrl>