Add DispatcherErrorHandler allow WPF addins to use SharpDevelop's unhandled exception dialog.

Fixed expected output in failing NRefactory unit test.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/3.0@3824 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Libraries/NRefactory/Test/Output/SpecialOutputVisitorTest.cs

@@ -209,7 +209,7 @@ End Class");
 		{
 			TestProgramCS2VB("class A { [PreserveSig] public void B(// comment\nint c) {} }",
 			                 "Class A\n" +
-			                 "    ' comment\n" +
+			                 "  ' comment\n" +
 			                 "  <PreserveSig> _\n" +
 			                 "  Public Sub B(c As Integer)\n" +
 			                 "  End Sub\n" +

src/Main/ICSharpCode.Core.Presentation/DispatcherErrorHandler.cs

@@ -0,0 +1,40 @@
+// <file>
+//     <copyright see="prj:///doc/copyright.txt"/>
+//     <license see="prj:///doc/license.txt"/>
+//     <author name="Daniel Grunwald"/>
+//     <version>$Revision$</version>
+// </file>
+
+using System;
+using System.Windows.Threading;
+
+namespace ICSharpCode.Core.Presentation
+{
+	public static class DispatcherErrorHandler
+	{
+		[ThreadStatic] static bool isRegistered;
+		
+		/// <summary>
+		/// Registers the WPF error handler for this thread.
+		/// If the error handler is already registered, this method does nothing.
+		/// 
+		/// WPF applications should call this method when they initialize to prevent
+		/// SharpDevelop from crashing completely when there is an error in WPF event handlers.
+		/// </summary>
+		public static void Register()
+		{
+			if (!isRegistered) {
+				isRegistered = true;
+				Dispatcher.CurrentDispatcher.UnhandledException += DispatcherUnhandledException;
+			}
+		}
+		
+		static void DispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)
+		{
+			if (!e.Handled) {
+				e.Handled = true;
+				MessageService.ShowError(e.Exception, "Unhandled WPF exception");
+			}
+		}
+	}
+}

src/Main/ICSharpCode.Core.Presentation/ICSharpCode.Core.Presentation.csproj

@@ -62,6 +62,7 @@
       <Link>Properties\GlobalAssemblyInfo.cs</Link>
     </Compile>
     <Compile Include="ConditionalSeparator.cs" />
+    <Compile Include="DispatcherErrorHandler.cs" />
     <Compile Include="GetBitmapExtension.cs" />
     <Compile Include="IStatusUpdate.cs" />
     <Compile Include="LocalizeExtension.cs" />