add exit option to "solution/project changed" message

src/Main/Base/Project/Src/Project/ProjectChangeWatcher.cs

@@ -4,6 +4,7 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using ICSharpCode.Core;
+using ICSharpCode.SharpDevelop.Commands;
 using ICSharpCode.SharpDevelop.Gui;
 
 namespace ICSharpCode.SharpDevelop.Project
@@ -120,8 +121,12 @@ namespace ICSharpCode.SharpDevelop.Project
 			if (wasChangedExternally) {
 				wasChangedExternally = false;
 
-				if (ProjectService.OpenSolution != null && MessageService.ShowCustomDialog(MessageService.DefaultMessageBoxTitle, "${res:ICSharpCode.SharpDevelop.Project.SolutionAlteredExternallyMessage}", 0, 1, "${res:ICSharpCode.SharpDevelop.Project.ReloadSolution}", "${res:ICSharpCode.SharpDevelop.Project.KeepOldSolution}") == 0) {
-					ProjectService.LoadSolution(ProjectService.OpenSolution.FileName);
+				if (ProjectService.OpenSolution != null) {
+					int result = MessageService.ShowCustomDialog(MessageService.DefaultMessageBoxTitle, "${res:ICSharpCode.SharpDevelop.Project.SolutionAlteredExternallyMessage}", 0, 1, "${res:ICSharpCode.SharpDevelop.Project.ReloadSolution}", "${res:ICSharpCode.SharpDevelop.Project.KeepOldSolution}", "${res:ICSharpCode.SharpDevelop.ExceptionBox.ExitSharpDevelop}");
+					if (result == 0)
+						ProjectService.LoadSolution(ProjectService.OpenSolution.FileName);
+					else if (result == 2)
+						new ExitWorkbenchCommand().Run();
 				}
 			}
 		}