(via suggestion from Devin on Slack) We already show lines extended from the element as well as rules when entering element selection mode, so we should consider showing applicable grid/flex overlays as well.
<rdar://problem/105041619>
Pull request: https://github.com/WebKit/WebKit/pull/9653
Committed 259989@main (f51cad263067): <https://commits.webkit.org/259989@main> Reviewed commits have been landed. Closing PR #9653 and removing active labels.