Double-tap on the touchscreen issue about jspaint HOT 2 CLOSED

In jspaint, the behavior I intended was that a second finger would cancel the operation, in analogy to how right clicking when drawing with the left button or left clicking when drawing with the right button cancels it in mspaint 95/85/XP ("quick undo"), and then ideally you'd be able to scroll the document, maybe zoom too, from that two-fingered gesture.

The canceling part I had implemented but then browsers changed their implementations of touch/pointer events (as far as I can tell) and now neither quick undo for multiple touches or for multiple mouse buttons works.
(I had handled them both with the same code. It was pretty elegant. That probably won't work anymore.)

from jspaint.

Closing in favor of #9

from jspaint.