calling undo() or redo() can lead to a race condition accessing image

[gmatrangola]

In both undo() and redo() there is a call to redraw() which is async. In my app I perform an action on the image immediately after each call to undo and redo.
Something like this..
<button @click="writing canvas.redo(); doSomething(image);">
I think the call to redraw() hasn't finished when doSomething() function is called.
I suggest making redo() and undo() async and calling redraw() with the await keyword,