Undo

[nthiery]

Enable undoing the last action with Ctrl-Z for all actions.

Main use case: accidental typing or clicking. For that, recursive undo is probably not needed.

[barais]

Huge modifications ;).

I will discuss with @arnobl to see how to manage it correctly

[nthiery]

Yeah, I bet. Even small steps (like taking care of some simpler cases) are helpful!

Thanks for investigating.

[nthiery]

Thinking more about it while grading: the most useful part would be when hand drawing
over the copies. Typically you make a stroke and it's not super precise; so you want to redo
it. Currently you need to switch to the erase tool, select the stroke, switch back to the
drawing tool. Ctrl-Z would be much faster.