Multiple canvases: managing history undo and redo

[charlesmudy]

Hi,

So I have been using fabric-history and works greatly for 1 canvas. Now we have implemented multiple canvases stored in an array and all functions works well except the history, it seem to only work on 1 canvas, so when I loop through canvases, it will do multiple undo which is not what I want.

My question is how can I have multiple canvases but the history undo goes back 1 by 1

I feel the whole canvases should be stored in history instead of per canvas but not sure how to implement this.

@alimozdemir