Mono.TextEditor.TextDocument.Undo C# (CSharp) Method

		public void Undo ()
		{
			if (undoStack.Count <= 0)
				return;
			OnBeforeUndoOperation (EventArgs.Empty);
			isInUndo = true;
			var operation = undoStack.Pop ();
			redoStack.Push (operation);
			operation.Undo (this);
			isInUndo = false;
			OnUndone (new UndoOperationEventArgs (operation));
		}