OverlayRegions behavior needs to be set before we update OverlayRegions rects
<rdar://problem/122869093>
Pull request: https://github.com/WebKit/WebKit/pull/24340
Committed 274547@main (c66367e3d7fd): <https://commits.webkit.org/274547@main> Reviewed commits have been landed. Closing PR #24340 and removing active labels.