added an option to deactivate the focus highlight

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/CodeEditorView.cs

@@ -451,7 +451,8 @@ namespace ICSharpCode.AvalonEdit.AddIn
 			this.Adapter.JumpTo(line, column);
 			this.Focus();
 			
-			Dispatcher.Invoke(DispatcherPriority.Background, (Action)DisplayFocusHighlight);
+			if (CodeEditorOptions.Instance.HighlightFocus)
+				Dispatcher.Invoke(DispatcherPriority.Background, (Action)DisplayFocusHighlight);
 		}
 		
 		void DisplayFocusHighlight()

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/Options/CodeEditorOptions.cs

@@ -144,6 +144,19 @@ namespace ICSharpCode.AvalonEdit.AddIn.Options
 			}
 		}
 		
+		bool highlightFocus = true;
+		
+		[DefaultValue(true)]
+		public bool HighlightFocus {
+			get { return highlightFocus; }
+			set {
+				if (highlightFocus != value) {
+					highlightFocus = value;
+					OnPropertyChanged("HighlightFocus");
+				}
+			}
+		}
+		
 		bool useSmartIndentation = true;
 		
 		[DefaultValue(true)]

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/Options/TextViewOptions.xaml

@@ -24,6 +24,9 @@
 				<CheckBox
 					IsChecked="{core:OptionBinding local:CodeEditorOptions.HighlightSymbol}"
 					Content="{core:Localize Dialog.Options.IDEOptions.TextEditor.Markers.HighlightSymbolCheckBox}" />
+				<CheckBox
+					IsChecked="{core:OptionBinding local:CodeEditorOptions.HighlightFocus}"
+					Content="{core:Localize Dialog.Options.IDEOptions.TextEditor.Markers.HighlightFocusCheckBox}" />
 			</widgets:StackPanelWithSpacing>
 		</GroupBox>
 	</StackPanel>