It looks like we're not sizing the subgrid items correctly in the columns direction when determining row sizes.
<rdar://problem/89219026>
Created attachment 453127 [details] Patch
Committed r290577 (247855@main): <https://commits.webkit.org/247855@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 453127 [details].
Re-opened since this is blocked by bug 237264
Created attachment 453936 [details] Patch for landing
This patch modifies the imported WPT tests. Please ensure that any changes on the tests (not coming from a WPT import) are exported to WPT. Please see https://trac.webkit.org/wiki/WPTExportProcess
Committed r290879 (248110@main): <https://commits.webkit.org/248110@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 453936 [details].