Use XML highlighting for file extensions defined in XMLEditor.addin file.

src/AddIns/DisplayBindings/XmlEditor/Project/Src/XmlLanguageBinding.cs

@@ -2,6 +2,7 @@
 // This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
 
 using System;
+using ICSharpCode.AvalonEdit.Highlighting;
 using ICSharpCode.SharpDevelop;
 using ICSharpCode.SharpDevelop.Editor;
 
@@ -20,8 +21,9 @@ namespace ICSharpCode.XmlEditor
 		{
 			// HACK: disable SharpDevelop's built-in folding
 			codeEditorView = editor.GetService(typeof(AvalonEdit.TextEditor)) as AvalonEdit.AddIn.CodeEditorView;
-			if (codeEditorView != null)
+			DisableParseInformationFolding();
-				codeEditorView.DisableParseInformationFolding = true;
+
+			UpdateHighlightingIfNotXml();
 				
 			foldingManager = new XmlFoldingManager(editor);
 			foldingManager.UpdateFolds();
@@ -30,15 +32,54 @@ namespace ICSharpCode.XmlEditor
 			base.Attach(editor);
 		}
 		
+		void UpdateHighlightingIfNotXml()
+		{
+			if (codeEditorView != null) {
+				if (!IsUsingXmlHighlighting()) {
+					ChangeHighlightingToXml();
+				}
+			}
+		}
+		
+		bool IsUsingXmlHighlighting()
+		{
+			IHighlightingDefinition highlighting = codeEditorView.SyntaxHighlighting;
+			if (highlighting != null) {
+				return highlighting.Name == "XML";
+			}
+			return false;
+		}
+		
+		void ChangeHighlightingToXml()
+		{
+			codeEditorView.SyntaxHighlighting =	HighlightingManager.Instance.GetDefinition("XML");
+		}
+		
 		public override void Detach()
 		{
 			foldingManager.Stop();
 			foldingManager.Dispose();
 			
-			if (codeEditorView != null)
+			EnableParseInformationFolding();
-				codeEditorView.DisableParseInformationFolding = false;
 			
 			base.Detach();
 		}
+		
+		void DisableParseInformationFolding()
+		{
+			DisableParseInformationFolding(true);
+		}
+		
+		void DisableParseInformationFolding(bool disable)
+		{
+			if (codeEditorView != null) {
+				codeEditorView.DisableParseInformationFolding = disable;
+			}
+		}
+		
+		void EnableParseInformationFolding()
+		{
+			DisableParseInformationFolding(false);
+		}
 	}
 }

src/AddIns/DisplayBindings/XmlEditor/XmlEditor.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 11.00
 # Visual Studio 2010
-# SharpDevelop 4.0.0.6374
+# SharpDevelop 4.1.0.7289-alpha
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "XmlEditor", "Project\XmlEditor.csproj", "{DCA2703D-250A-463E-A68A-07ED105AE6BD}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "XmlEditor.Tests", "Test\XmlEditor.Tests.csproj", "{FC0FE702-A87D-4D70-A9B6-1ECCD611125F}"
@@ -22,6 +22,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "NRefactory", "..\..\..\Libr
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ICSharpCode.SharpDevelop.Tests", "..\..\..\Main\Base\Test\ICSharpCode.SharpDevelop.Tests.csproj", "{4980B743-B32F-4aba-AABD-45E2CAD3568D}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AvalonEdit.AddIn", "..\AvalonEdit.AddIn\AvalonEdit.AddIn.csproj", "{0162E499-42D0-409B-AA25-EED21F75336B}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -72,5 +74,9 @@ Global
 		{4980B743-B32F-4ABA-AABD-45E2CAD3568D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{4980B743-B32F-4ABA-AABD-45E2CAD3568D}.Release|Any CPU.Build.0 = Release|Any CPU
 		{4980B743-B32F-4ABA-AABD-45E2CAD3568D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{0162E499-42D0-409B-AA25-EED21F75336B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{0162E499-42D0-409B-AA25-EED21F75336B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{0162E499-42D0-409B-AA25-EED21F75336B}.Release|Any CPU.Build.0 = Release|Any CPU
+		{0162E499-42D0-409B-AA25-EED21F75336B}.Release|Any CPU.ActiveCfg = Release|Any CPU
 	EndGlobalSection
 EndGlobal