WpfWorkbench.OnDrop: don't show dialogs during the drop event; use Dispatcher.BeginInvoke instead.

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Resolver/CSharpResolver.cs

@@ -1694,8 +1694,7 @@ namespace ICSharpCode.NRefactory.CSharp.Resolver
 				case NameLookupMode.Type:
 				case NameLookupMode.TypeInUsingDeclaration:
 				case NameLookupMode.BaseTypeReference:
-					result = lookup.LookupType(target.Type, identifier, typeArguments, parameterizeResultType);
-					break;
+					return lookup.LookupType(target.Type, identifier, typeArguments, parameterizeResultType);
 				default:
 					throw new NotSupportedException("Invalid value for NameLookupMode");
 			}

src/Main/Core/Project/Src/Services/FileUtility/FileUtility.cs

@@ -648,6 +648,7 @@ namespace ICSharpCode.Core
 
 		static FileOperationResult ObservedSaveHandleError(Exception e, NamedFileOperationDelegate saveFileAs, FileName fileName, string message, FileErrorPolicy policy)
 		{
+			message = message + Environment.NewLine + Environment.NewLine + e.Message;
 			var messageService = ServiceSingleton.GetRequiredService<IMessageService>();
 			switch (policy) {
 				case FileErrorPolicy.Inform:
@@ -693,6 +694,7 @@ namespace ICSharpCode.Core
 
 		static FileOperationResult ObservedLoadHandleException(Exception e, FileOperationDelegate loadFile, FileName fileName, string message, FileErrorPolicy policy)
 		{
+			message = message + Environment.NewLine + Environment.NewLine + e.Message;
 			var messageService = ServiceSingleton.GetRequiredService<IMessageService>();
 			switch (policy) {
 				case FileErrorPolicy.Inform:

src/Main/SharpDevelop/Workbench/WpfWorkbench.cs

@@ -107,7 +107,7 @@ namespace ICSharpCode.SharpDevelop.Workbench
 			// Set WindowState after PresentationSource is initialized, because now bounds and location are properly set.
 			this.WindowState = lastNonMinimizedWindowState;
 		}
-
+		
 		void SetBounds(Rect bounds)
 		{
 			this.Left = bounds.Left;
@@ -174,7 +174,7 @@ namespace ICSharpCode.SharpDevelop.Workbench
 		// keep a reference to the event handler to prevent it from being garbage collected
 		// (CommandManager.RequerySuggested only keeps weak references to the event handlers)
 		EventHandler requerySuggestedEventHandler;
-
+		
 		void CommandManager_RequerySuggested(object sender, EventArgs e)
 		{
 			UpdateMenu();
@@ -270,9 +270,9 @@ namespace ICSharpCode.SharpDevelop.Workbench
 			get {
 				SD.MainThread.VerifyAccess();
 				return (from window in WorkbenchWindowCollection
-				        where window.ViewContents.Count > 0
-				        select window.ViewContents[0]
-				       ).ToList().AsReadOnly();
+					where window.ViewContents.Count > 0
+					select window.ViewContents[0]
+				).ToList().AsReadOnly();
 			}
 		}
 		
@@ -319,7 +319,7 @@ namespace ICSharpCode.SharpDevelop.Workbench
 				}
 			}
 		}
-
+		
 		void WorkbenchWindowActiveViewContentChanged(object sender, EventArgs e)
 		{
 			if (workbenchLayout != null) {
@@ -671,22 +671,29 @@ namespace ICSharpCode.SharpDevelop.Workbench
 					string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
 					if (files == null)
 						return;
-					foreach (string file in files) {
-						if (File.Exists(file)) {
-							var fileName = FileName.Create(file);
-							if (SD.ProjectService.IsSolutionOrProjectFile(fileName)) {
-								SD.ProjectService.OpenSolutionOrProject(fileName);
-							} else {
-								SD.FileService.OpenFile(fileName);
-							}
-						}
-					}
+					// Handle opening the files outside the drop event, so that the drag source doesn't think
+					// the operation is still in progress while we're showing a "file cannot be opened" error message.
+					Dispatcher.BeginInvoke(DispatcherPriority.Normal, new Action<string[]>(HandleDrop), files);
 				}
 			} catch (Exception ex) {
 				MessageService.ShowException(ex);
 			}
 		}
 		
+		void HandleDrop(string[] files)
+		{
+			foreach (string file in files) {
+				if (File.Exists(file)) {
+					var fileName = FileName.Create(file);
+					if (SD.ProjectService.IsSolutionOrProjectFile(fileName)) {
+						SD.ProjectService.OpenSolutionOrProject(fileName);
+					} else {
+						SD.FileService.OpenFile(fileName);
+					}
+				}
+			}
+		}
+		
 		void InitFocusTrackingEvents()
 		{
 			#if DEBUG
@@ -700,7 +707,7 @@ namespace ICSharpCode.SharpDevelop.Workbench
 		{
 			#if DEBUG
 			if (enableFocusDebugOutput)
-				LoggingService.DebugFormatted(format, args);
+			LoggingService.DebugFormatted(format, args);
 			#endif
 		}
 		
@@ -709,55 +716,55 @@ namespace ICSharpCode.SharpDevelop.Workbench
 		
 		void WpfWorkbench_PreviewGotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
 		{
-			FocusDebug("GotKeyboardFocus: oldFocus={0}, newFocus={1}", e.OldFocus, e.NewFocus);
+		FocusDebug("GotKeyboardFocus: oldFocus={0}, newFocus={1}", e.OldFocus, e.NewFocus);
 		}
 		
 		void WpfWorkbench_PreviewLostKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
 		{
-			FocusDebug("LostKeyboardFocus: oldFocus={0}, newFocus={1}", e.OldFocus, e.NewFocus);
+		FocusDebug("LostKeyboardFocus: oldFocus={0}, newFocus={1}", e.OldFocus, e.NewFocus);
 		}
 		
 		protected override void OnPreviewKeyDown(KeyEventArgs e)
 		{
-			base.OnPreviewKeyDown(e);
-			if (!e.Handled && e.Key == Key.D && e.KeyboardDevice.Modifiers == (ModifierKeys.Control | ModifierKeys.Shift | ModifierKeys.Alt)) {
-				enableFocusDebugOutput = !enableFocusDebugOutput;
+		base.OnPreviewKeyDown(e);
+		if (!e.Handled && e.Key == Key.D && e.KeyboardDevice.Modifiers == (ModifierKeys.Control | ModifierKeys.Shift | ModifierKeys.Alt)) {
+		enableFocusDebugOutput = !enableFocusDebugOutput;
 				
-				StringWriter output = new StringWriter();
-				output.WriteLine("Keyboard.FocusedElement = " + GetElementName(Keyboard.FocusedElement));
-				output.WriteLine("ActiveContent = " + GetElementName(this.ActiveContent));
-				output.WriteLine("ActiveViewContent = " + GetElementName(this.ActiveViewContent));
-				output.WriteLine("ActiveWorkbenchWindow = " + GetElementName(this.ActiveWorkbenchWindow));
-				((AvalonDockLayout)workbenchLayout).WriteState(output);
-				LoggingService.Debug(output.ToString());
-				e.Handled = true;
-			}
-			if (!e.Handled && e.Key == Key.F && e.KeyboardDevice.Modifiers == (ModifierKeys.Control | ModifierKeys.Shift | ModifierKeys.Alt)) {
-				if (TextOptions.GetTextFormattingMode(this) == TextFormattingMode.Display)
-					TextOptions.SetTextFormattingMode(this, TextFormattingMode.Ideal);
-				else
-					TextOptions.SetTextFormattingMode(this, TextFormattingMode.Display);
-				SD.StatusBar.SetMessage("TextFormattingMode=" + TextOptions.GetTextFormattingMode(this));
-			}
-			if (!e.Handled && e.Key == Key.R && e.KeyboardDevice.Modifiers == (ModifierKeys.Control | ModifierKeys.Shift | ModifierKeys.Alt)) {
-				switch (TextOptions.GetTextRenderingMode(this)) {
-					case TextRenderingMode.Auto:
-					case TextRenderingMode.ClearType:
-						TextOptions.SetTextRenderingMode(this, TextRenderingMode.Grayscale);
-						break;
-					case TextRenderingMode.Grayscale:
-						TextOptions.SetTextRenderingMode(this, TextRenderingMode.Aliased);
-						break;
-					default:
-						TextOptions.SetTextRenderingMode(this, TextRenderingMode.ClearType);
-						break;
-				}
-				SD.StatusBar.SetMessage("TextRenderingMode=" + TextOptions.GetTextRenderingMode(this));
-			}
-			if (!e.Handled && e.Key == Key.G && e.KeyboardDevice.Modifiers == (ModifierKeys.Control | ModifierKeys.Shift | ModifierKeys.Alt)) {
-				GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);
-				SD.StatusBar.SetMessage("Total memory = " + (GC.GetTotalMemory(true) / 1024 / 1024f).ToString("f1") + " MB");
-			}
+		StringWriter output = new StringWriter();
+		output.WriteLine("Keyboard.FocusedElement = " + GetElementName(Keyboard.FocusedElement));
+		output.WriteLine("ActiveContent = " + GetElementName(this.ActiveContent));
+		output.WriteLine("ActiveViewContent = " + GetElementName(this.ActiveViewContent));
+		output.WriteLine("ActiveWorkbenchWindow = " + GetElementName(this.ActiveWorkbenchWindow));
+		((AvalonDockLayout)workbenchLayout).WriteState(output);
+		LoggingService.Debug(output.ToString());
+		e.Handled = true;
+		}
+		if (!e.Handled && e.Key == Key.F && e.KeyboardDevice.Modifiers == (ModifierKeys.Control | ModifierKeys.Shift | ModifierKeys.Alt)) {
+		if (TextOptions.GetTextFormattingMode(this) == TextFormattingMode.Display)
+		TextOptions.SetTextFormattingMode(this, TextFormattingMode.Ideal);
+		else
+		TextOptions.SetTextFormattingMode(this, TextFormattingMode.Display);
+		SD.StatusBar.SetMessage("TextFormattingMode=" + TextOptions.GetTextFormattingMode(this));
+		}
+		if (!e.Handled && e.Key == Key.R && e.KeyboardDevice.Modifiers == (ModifierKeys.Control | ModifierKeys.Shift | ModifierKeys.Alt)) {
+		switch (TextOptions.GetTextRenderingMode(this)) {
+		case TextRenderingMode.Auto:
+		case TextRenderingMode.ClearType:
+		TextOptions.SetTextRenderingMode(this, TextRenderingMode.Grayscale);
+		break;
+		case TextRenderingMode.Grayscale:
+		TextOptions.SetTextRenderingMode(this, TextRenderingMode.Aliased);
+		break;
+		default:
+		TextOptions.SetTextRenderingMode(this, TextRenderingMode.ClearType);
+		break;
+		}
+		SD.StatusBar.SetMessage("TextRenderingMode=" + TextOptions.GetTextRenderingMode(this));
+		}
+		if (!e.Handled && e.Key == Key.G && e.KeyboardDevice.Modifiers == (ModifierKeys.Control | ModifierKeys.Shift | ModifierKeys.Alt)) {
+		GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);
+		SD.StatusBar.SetMessage("Total memory = " + (GC.GetTotalMemory(true) / 1024 / 1024f).ToString("f1") + " MB");
+		}
 		}
 		#endif