If we see a closing tag that really demands a new block after it,
like </ul>, that needs to be done even if some ignorable whitespace
and "inline" tags come after it. Don't get distracted by those.
Also add a comment in QTextDocument::setHtml() to remind the reader that
HTML parsing is a two-pass algorithm.
Pick-to: 6.6 6.7
Fixes: QTBUG-81662
Change-Id: If723c9d3c211a684725055a06bcf87be4e38923a
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>