Fix minor memory leak in AvalonEdit.

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit.Tests/WeakReferenceTests.cs

@@ -2,6 +2,7 @@
 // This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
 
 using System;
+using System.Windows.Threading;
 using ICSharpCode.AvalonEdit.Document;
 using ICSharpCode.AvalonEdit.Editing;
 using ICSharpCode.AvalonEdit.Rendering;
@@ -45,7 +46,6 @@ namespace ICSharpCode.AvalonEdit
 		}
 		
 		[Test]
-		[Ignore]
 		public void DocumentDoesNotHoldReferenceToTextArea()
 		{
 			TextDocument textDocument = new TextDocument();
@@ -61,7 +61,6 @@ namespace ICSharpCode.AvalonEdit
 		}
 		
 		[Test]
-		[Ignore]
 		public void DocumentDoesNotHoldReferenceToTextEditor()
 		{
 			TextDocument textDocument = new TextDocument();
@@ -102,9 +101,12 @@ namespace ICSharpCode.AvalonEdit
 		
 		static void GarbageCollect()
 		{
-			GC.WaitForPendingFinalizers();
+			for (int i = 0; i < 3; i++) {
-			GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);
+				GC.WaitForPendingFinalizers();
-			GC.WaitForPendingFinalizers();
+				GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);
+				// pump WPF messages so that WeakEventManager can unregister
+				Dispatcher.CurrentDispatcher.Invoke(DispatcherPriority.Background, new Action(delegate {}));
+			}
 		}
 	}
 }

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Editing/CaretNavigationCommandHandler.cs

@@ -73,6 +73,8 @@ namespace ICSharpCode.AvalonEdit.Editing
 			AddBinding(EditingCommands.SelectToDocumentEnd, Ctrl | Shift, Key.End, OnMoveCaretExtendSelection(CaretMovementType.DocumentEnd));
 			
 			CommandBindings.Add(new CommandBinding(ApplicationCommands.SelectAll, OnSelectAll));
+			
+			TextAreaDefaultInputHandler.WorkaroundWPFMemoryLeak(InputBindings);
 		}
 		
 		static void OnSelectAll(object target, ExecutedRoutedEventArgs args)

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Editing/EditingCommandHandler.cs

@@ -75,6 +75,8 @@ namespace ICSharpCode.AvalonEdit.Editing
 			CommandBindings.Add(new CommandBinding(AvalonEditCommands.ConvertLeadingTabsToSpaces, OnConvertLeadingTabsToSpaces));
 			CommandBindings.Add(new CommandBinding(AvalonEditCommands.ConvertLeadingSpacesToTabs, OnConvertLeadingSpacesToTabs));
 			CommandBindings.Add(new CommandBinding(AvalonEditCommands.IndentSelection, OnIndentSelection));
+			
+			TextAreaDefaultInputHandler.WorkaroundWPFMemoryLeak(InputBindings);
 		}
 		
 		static TextArea GetTextArea(object target)

src/Libraries/AvalonEdit/ICSharpCode.AvalonEdit/Editing/TextAreaDefaultInputHandlers.cs

@@ -2,7 +2,7 @@
 // This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
 
 using System;
-using System.Linq;
+using System.Collections.Generic;
 using System.Windows;
 using System.Windows.Input;
 
@@ -54,6 +54,16 @@ namespace ICSharpCode.AvalonEdit.Editing
 			return kb;
 		}
 		
+		internal static void WorkaroundWPFMemoryLeak(List<InputBinding> inputBindings)
+		{
+			// Work around WPF memory leak:
+			// KeyBinding retains a reference to whichever UIElement it is used in first.
+			// Using a dummy element for this purpose ensures that we don't leak
+			// a real text editor (which a potentially large document).
+			UIElement dummyElement = new UIElement();
+			dummyElement.InputBindings.AddRange(inputBindings);
+		}
+		
 		#region Undo / Redo
 		UndoStack GetUndoStack()
 		{