AvalonEdit: handle Shift-Tab

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@3691 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

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

@@ -35,6 +35,7 @@ namespace ICSharpCode.AvalonEdit.Gui
 			AddBinding(EditingCommands.Delete, ModifierKeys.None, Key.Delete, OnDelete(EditingCommands.SelectRightByCharacter));
 			AddBinding(EditingCommands.DeleteNextWord, ModifierKeys.Control, Key.Delete, OnDelete(EditingCommands.SelectRightByWord));
 			AddBinding(EditingCommands.Backspace, ModifierKeys.None, Key.Back, OnDelete(EditingCommands.SelectLeftByCharacter));
+			InputBindings.Add(new KeyBinding(EditingCommands.Backspace, Key.Back, ModifierKeys.Shift)); // make Shift-Backspace do the same as plain backspace
 			AddBinding(EditingCommands.DeletePreviousWord, ModifierKeys.Control, Key.Back, OnDelete(EditingCommands.SelectLeftByWord));
 			AddBinding(EditingCommands.EnterParagraphBreak, ModifierKeys.None, Key.Enter, OnEnter);
 			AddBinding(EditingCommands.EnterLineBreak, ModifierKeys.Shift, Key.Enter, OnEnter);