Fix #378: CaretReferenceHighlightRenderer cannot be turned off.

src/AddIns/BackendBindings/CSharpBinding/Project/Src/CaretReferenceHighlightRenderer.cs

@@ -78,6 +78,12 @@ namespace CSharpBinding
 
 		public void Draw(TextView textView, DrawingContext drawingContext)
 		{
+			var codeEditorOptions = editor.Options as ICodeEditorOptions;
+			if ((codeEditorOptions != null) && !codeEditorOptions.HighlightSymbol) {
+				// User has disabled highlighting of symbols
+				return;
+			}
+			
 			if (currentReferences == null) {
 				if (textView.VisualLines.Count == 0)
 					return;

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

@@ -27,7 +27,7 @@ using ICSharpCode.SharpDevelop.Gui;
 namespace ICSharpCode.AvalonEdit.AddIn.Options
 {
 	[Serializable]
-	public class CodeEditorOptions : TextEditorOptions, ITextEditorOptions
+	public class CodeEditorOptions : TextEditorOptions, ITextEditorOptions, ICodeEditorOptions
 	{
 		static readonly Lazy<CodeEditorOptions> instance = new Lazy<CodeEditorOptions>(
 			() => PropertyService.Get("CodeEditorOptions", new CodeEditorOptions()));

src/Main/Base/Project/Editor/ICodeEditorOptions.cs

@@ -0,0 +1,114 @@
+// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using System;
+using System.ComponentModel;
+
+namespace ICSharpCode.SharpDevelop.Editor
+{
+	/// <summary>
+	/// Code editor options.
+	/// </summary>
+	public interface ICodeEditorOptions : INotifyPropertyChanged
+	{
+		bool AllowScrollBelowDocument {
+			get;
+			set;
+		}
+		
+		string FontFamily {
+			get;
+			set;
+		}
+
+		double FontSize {
+			get;
+			set;
+		}
+		
+		bool ShowLineNumbers {
+			get;
+			set;
+		}
+
+		bool EnableChangeMarkerMargin {
+			get;
+			set;
+		}
+		
+		bool WordWrap {
+			get;
+			set;
+		}
+		
+		bool CtrlClickGoToDefinition {
+			get;
+			set;
+		}
+		
+		bool MouseWheelZoom {
+			get;
+			set;
+		}
+		
+		bool UnderlineErrors {
+			get;
+			set;
+		}
+		
+		bool HighlightBrackets {
+			get;
+			set;
+		}
+		
+		bool HighlightSymbol {
+			get;
+			set;
+		}
+		
+		bool EnableAnimations {
+			get;
+			set;
+		}
+		
+		bool UseSmartIndentation {
+			get;
+			set;
+		}
+		
+		bool EnableFolding {
+			get;
+			set;
+		}
+		
+		bool EnableQuickClassBrowser {
+			get;
+			set;
+		}
+		
+		bool ShowHiddenDefinitions {
+			get;
+			set;
+		}
+		
+		bool AutoInsertBlockEnd {
+			get;
+			set;
+		}
+	}
+}

src/Main/Base/Project/ICSharpCode.SharpDevelop.csproj

@@ -147,6 +147,7 @@
     <Compile Include="Editor\DocumentServiceAttribute.cs" />
     <Compile Include="Editor\DocumentUtilities.cs" />
     <Compile Include="Editor\IBracketSearcher.cs" />
+    <Compile Include="Editor\ICodeEditorOptions.cs" />
     <Compile Include="Editor\IDocumentVersionProvider.cs" />
     <Compile Include="Editor\IEditorControlService.cs" />
     <Compile Include="Editor\IEditorUIService.cs" />