The default TextFlow constructor should just be used. The sideways writing mode logic is incorrect in there.
<rdar://problem/130808015>
Pull request: https://github.com/WebKit/WebKit/pull/30300
Committed 280500@main (e6d038446cca): <https://commits.webkit.org/280500@main> Reviewed commits have been landed. Closing PR #30300 and removing active labels.
Re-opened since this is blocked by bug 276138
*** This bug has been marked as a duplicate of bug 277057 ***