Instead of mapping first baseline to grid axis start and last baseline to grid axis end, we need to consider the fallback alignment of the grid items https://drafts.csswg.org/css-align-3/#align-by-baseline
<rdar://problem/115136343>
Pull request: https://github.com/WebKit/WebKit/pull/17555
Committed 267811@main (256590954964): <https://commits.webkit.org/267811@main> Reviewed commits have been landed. Closing PR #17555 and removing active labels.