The body editor was told to focus itself with
autoFocus={d.to.length > 0 && Boolean(d.subject)}
and RichEditor ran that as an effect keyed on the prop. Typing the first
letter of a subject flipped Boolean(d.subject) false -> true, the effect fired,
and the caret jumped from the subject line into the message body.
autoFocus now means what it means on a DOM element: focus on mount. RichEditor
captures the prop in a ref and focuses once, and the composer decides where the
caret starts when it opens - recipients for a blank message, body for a reply
that already has recipients and a subject - instead of deriving it from state
that changes as the user types.
initialFocusTarget is extracted and exported so the rule is stated in one place
and tested. The regression test renders RichEditor and asserts it does not take
focus from a field being typed into; it fails against the previous effect.
jcoffey-dev
8faf9002c2