Last week I disabled smart lists in Firefox in 2ab4913d13.
This week the same issue presented itself in Chrome. Turns out,
the list modification was still not firing at the right time
in the event chain. I investigated and it looks as though
`beforeinput` is a better fit, since:
> This allows web apps to override text edit behavior before the browser
modifies the DOM tree, and provides more control over input events to
improve performance.
c.f. https://developer.mozilla.org/en-US/docs/Web/API/Element/beforeinput_event
and https://webkit.org/blog/7358/enhanced-editing-with-input-events/
and https://www.w3.org/TR/uievents/#events-keyboard-event-order
The order of keyboard events is `keydown` -> `beforeinput` -> `input` -> `keyup`
I changed to detect the event type of `insertLineBreak` which is
not always consistently true in `input` events. If it's true when
`beforeinput` is fired then we go ahead with the smart list when
`input` fires.
8c038d9498