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

		public void OptimizeTypedUndo ()
		{
			if (undoStack.Count == 0)
				return;
			UndoOperation top = undoStack.Pop ();
			if (top.Args == null || top.Args.InsertedText == null || top.Args.InsertionLength != 1 || (top is KeyboardStackUndo && ((KeyboardStackUndo)top).IsClosed)) {
				undoStack.Push (top);
				return;
			}
			if (undoStack.Count == 0 || !(undoStack.Peek () is KeyboardStackUndo)) 
				undoStack.Push (new KeyboardStackUndo ());
			var keyUndo = (KeyboardStackUndo)undoStack.Pop ();
			if (keyUndo.IsClosed) {
				undoStack.Push (keyUndo);
				keyUndo = new KeyboardStackUndo ();
			}
			if (keyUndo.Args != null && keyUndo.Args.Offset + 1 != top.Args.Offset || !char.IsLetterOrDigit (top.Args.InsertedText.GetCharAt (0))) {
				keyUndo.IsClosed = true;
				undoStack.Push (keyUndo);
				keyUndo = new KeyboardStackUndo ();
			}
			keyUndo.Add (top);
			undoStack.Push (keyUndo);
		}