implement SD-1855 - Add option for disabling ChangeMarkerMargin

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

@@ -117,8 +117,9 @@ namespace ICSharpCode.AvalonEdit.AddIn
 					} else {
 						this.errorPainter.UpdateErrors();
 					}
-					changeWatcher.Initialize(this.DocumentAdapter);
-					
+					if (changeWatcher != null) {
+						changeWatcher.Initialize(this.DocumentAdapter);
+					}
 					FetchParseInformation();
 				}
 			}
@@ -145,8 +146,9 @@ namespace ICSharpCode.AvalonEdit.AddIn
 			
 			textMarkerService = new TextMarkerService(this);
 			iconBarManager = new IconBarManager();
-			changeWatcher = new DefaultChangeWatcher();
-			
+			if (CodeEditorOptions.Instance.EnableChangeMarkerMargin) {
+				changeWatcher = new DefaultChangeWatcher();
+			}
 			primaryTextEditor = CreateTextEditor();
 			primaryTextEditorAdapter = (CodeEditorAdapter)primaryTextEditor.TextArea.GetService(typeof(ITextEditor));
 			Debug.Assert(primaryTextEditorAdapter != null);
@@ -205,7 +207,9 @@ namespace ICSharpCode.AvalonEdit.AddIn
 			textView.Services.AddService(typeof(IBookmarkMargin), iconBarManager);
 			codeEditorView.TextArea.LeftMargins.Insert(0, new IconBarMargin(iconBarManager));
 			
-			codeEditorView.TextArea.LeftMargins.Add(new ChangeMarkerMargin(changeWatcher));
+			if (CodeEditorOptions.Instance.EnableChangeMarkerMargin) {
+				codeEditorView.TextArea.LeftMargins.Add(new ChangeMarkerMargin(changeWatcher));
+			}
 			
 			textView.Services.AddService(typeof(ISyntaxHighlighter), new AvalonEditSyntaxHighlighterAdapter(textView));
 			

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

@@ -66,6 +66,19 @@ namespace ICSharpCode.AvalonEdit.AddIn.Options
 			}
 		}
 		
+		bool enableChangeMarkerMargin = true;
+		
+		[DefaultValue(true)]
+		public bool EnableChangeMarkerMargin {
+			get { return enableChangeMarkerMargin; }
+			set {
+				if (enableChangeMarkerMargin != value) {
+					enableChangeMarkerMargin = value;
+					OnPropertyChanged("EnableChangeMarkerMargin");
+				}
+			}
+		}
+		
 		bool wordWrap;
 		
 		[DefaultValue(false)]

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

@@ -17,6 +17,9 @@
 				<CheckBox 
 					IsChecked="{core:OptionBinding local:CodeEditorOptions.EnableFolding}"
 					Content="{core:Localize Dialog.Options.IDEOptions.TextEditor.General.FoldingCheckBox}" />
+				<CheckBox
+					IsChecked="{core:OptionBinding local:CodeEditorOptions.EnableChangeMarkerMargin}"
+					Content="{core:Localize Dialog.Options.IDEOptions.TextEditor.General.ChangeMarkerMarginCheckBox}" />
 				<CheckBox 
 					IsChecked="{core:OptionBinding local:CodeEditorOptions.EnableQuickClassBrowser}"
 					Content="{core:Localize Dialog.Options.IDEOptions.TextEditor.General.ShowQuickClassBrowserCheckBox}" />