When the root editable element is a phrasing content such as a, em, strong, etc..., we should insert a BR instead of the default paragraph separator (div or p).
Pull request: https://github.com/WebKit/WebKit/pull/10065
Committed 260242@main (37c9962af2e3): <https://commits.webkit.org/260242@main> Reviewed commits have been landed. Closing PR #10065 and removing active labels.
<rdar://problem/105438898>