Andrew Shu authored Jul 14, 2020 and Deimos committed Feb 21, 2021

If user types "tag1 tag2" then adds a comma between,
it should respect the comma to give "tag1" and "tag2".

We use keydown and setTimeout because keyup
works on a keyboard but not reliably on mobile.

Nonzero timeout is needed or else the comma is sometimes
inserted too late and not seen by addChip(),
tested on desktop Firefox.