Use custom dialog for assertion failures.

The new dialog allows viewing the full stack trace; and ignoring all occurrences of a given assertion.

src/Main/Base/Project/Src/Gui/Dialogs/SharpDevelopAboutPanels.cs

@@ -2,6 +2,7 @@
 // This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
 
 using System;
+using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
 using System.Reflection;
@@ -79,6 +80,8 @@ namespace ICSharpCode.SharpDevelop.Gui
 			#if DEBUG
 			if (e.KeyData == (Keys.Control | Keys.Shift | Keys.E)) {
 				throw new ClownFishException();
+			} else if (e.KeyData == (Keys.Control | Keys.Shift | Keys.A)) {
+				Trace.Fail("Trace failure");
 			} else if (e.KeyData == (Keys.Control | Keys.Shift | Keys.G)) {
 				GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);
 				GC.WaitForPendingFinalizers();

src/Main/ICSharpCode.Core.WinForms/MessageService/CustomDialog.cs

@@ -7,7 +7,7 @@ using System.Windows.Forms;
 
 namespace ICSharpCode.Core.WinForms
 {
-	sealed class CustomDialog : System.Windows.Forms.Form
+	public sealed class CustomDialog : System.Windows.Forms.Form
 	{
 		System.Windows.Forms.Label label;
 		System.Windows.Forms.Panel panel;

src/Main/SharpDevelop/Logging/ExceptionBox.cs

@@ -76,18 +76,17 @@ namespace ICSharpCode.SharpDevelop.Logging
 		[SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes")]
 		static void ShowErrorBox(Exception exception, string message, bool mustTerminate)
 		{
-			if (exception == null)
-				throw new ArgumentNullException("exception");
-			
 			// ignore reentrant calls (e.g. when there's an exception in OnRender)
 			if (showingBox)
 				return;
 			showingBox = true;
 			try {
-				try {
-					SD.AnalyticsMonitor.TrackException(exception);
-				} catch (Exception ex) {
-					LoggingService.Warn("Error tracking exception", ex);
+				if (exception != null) {
+					try {
+						SD.AnalyticsMonitor.TrackException(exception);
+					} catch (Exception ex) {
+						LoggingService.Warn("Error tracking exception", ex);
+					}
 				}
 				using (ExceptionBox box = new ExceptionBox(exception, message, mustTerminate)) {
 					if (SD.MainThread.InvokeRequired) {
@@ -98,7 +97,7 @@ namespace ICSharpCode.SharpDevelop.Logging
 				}
 			} catch (Exception ex) {
 				LoggingService.Warn("Error showing ExceptionBox", ex);
-				MessageBox.Show(exception.ToString(), message, MessageBoxButtons.OK,
+				MessageBox.Show(exception != null ? exception.ToString() : "Error", message, MessageBoxButtons.OK,
 				                MessageBoxIcon.Error, MessageBoxDefaultButton.Button1, MessageBoxOptions.DefaultDesktopOnly);
 			} finally {
 				showingBox = false;
@@ -155,8 +154,10 @@ namespace ICSharpCode.SharpDevelop.Logging
 			if (message != null) {
 				sb.AppendLine(message);
 			}
-			sb.AppendLine("Exception thrown:");
-			sb.AppendLine(exceptionThrown.ToString());
+			if (exceptionThrown != null) {
+				sb.AppendLine("Exception thrown:");
+				sb.AppendLine(exceptionThrown.ToString());
+			}
 			sb.AppendLine();
 			sb.AppendLine("---- Recent log messages:");
 			try {

src/Main/SharpDevelop/Logging/SDTraceListener.cs

@@ -0,0 +1,82 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Net.Mime;
+using System.Threading;
+using System.Windows;
+using System.Windows.Threading;
+using ICSharpCode.Core.WinForms;
+
+namespace ICSharpCode.SharpDevelop.Logging
+{
+	sealed class SDTraceListener : DefaultTraceListener
+	{
+		[Conditional("DEBUG")]
+		public static void Install()
+		{
+			Debug.Listeners.Clear();
+			Debug.Listeners.Add(new SDTraceListener());
+		}
+		
+		public SDTraceListener()
+		{
+			base.AssertUiEnabled = false;
+		}
+		
+		HashSet<string> ignoredStacks = new HashSet<string>();
+		bool dialogIsOpen;
+		
+		public override void Fail(string message)
+		{
+			this.Fail(message, null);
+		}
+		
+		public override void Fail(string message, string detailMessage)
+		{
+			base.Fail(message, detailMessage); // let base class write the assert to the debug console
+			if (dialogIsOpen)
+				return;
+			string stackTrace = "";
+			try {
+				stackTrace = new StackTrace(true).ToString();
+			} catch {}
+			lock (ignoredStacks) {
+				if (ignoredStacks.Contains(stackTrace))
+					return;
+			}
+			message = message + Environment.NewLine + detailMessage + Environment.NewLine + stackTrace;
+			dialogIsOpen = true;
+			CustomDialog inputBox = new CustomDialog("Assertion Failed", message.TakeStartEllipsis(750), -1, 2, new[] { "Show Stacktrace", "Debug", "Ignore", "Ignore All" });
+			try {
+				while (true) { // show the dialog repeatedly until an option other than 'Show Stacktrace' is selected
+					if (SD.MainThread.InvokeRequired) {
+						inputBox.ShowDialog();
+					} else {
+						inputBox.ShowDialog(SD.WinForms.MainWin32Window);
+					}
+					switch (inputBox.Result) {
+						case 0:
+							ExceptionBox.ShowErrorBox(null, message);
+							break; // show the custom dialog again
+						case 1:
+							Debugger.Break();
+							return;
+						case 2:
+							return;
+						case 3:
+							lock (ignoredStacks) {
+								ignoredStacks.Add(stackTrace);
+							}
+							return;
+					}
+				}
+			} finally {
+				dialogIsOpen = false;
+				inputBox.Dispose();
+			}
+		}
+	}
+}

src/Main/SharpDevelop/SharpDevelop.csproj

@@ -91,6 +91,7 @@
     <Compile Include="Editor\Bookmarks\BookmarkMenuCommands.cs" />
     <Compile Include="Editor\TextContentCondition.cs" />
     <Compile Include="Editor\TextSelectedCondition.cs" />
+    <Compile Include="Logging\SDTraceListener.cs" />
     <Compile Include="OptionPanels\LoadSaveOptions.xaml.cs">
       <DependentUpon>LoadSaveOptions.xaml</DependentUpon>
       <SubType>Code</SubType>

src/Main/SharpDevelop/Startup/SharpDevelopMain.cs

@@ -207,6 +207,7 @@ namespace ICSharpCode.SharpDevelop.Startup
 				for (int i = 0; i < fileList.Length; i++) {
 					workbenchSettings.InitialFileList.Add(fileList[i]);
 				}
+				SDTraceListener.Install();
 				host.RunWorkbench(workbenchSettings);
 			} finally {
 				LoggingService.Info("Leaving RunApplication()");