Edit/Undo no longer working when using polygon lasso tool

* Edit as you can't seem to delete or edit a post here. I realised I need to hit the "Delete" key on mac to take a step back when using the polygon lasso tool. It seems I was also confusing this feature with the "Pen" tool (to draw around an object and use "Make selection" in the context menu to create a selection). While using the Pen tool, you can use edit/undo to go back. Cheers.