<div><span style='white-space:nowrap'>
TEXT
</span>
</div>
should be turned into:
<div>
<span style='white-space:nowrap'>
TEXT
</span>
</div>
Docs: https://www.mediawiki.org/wiki/Help:Lint_errors/pwrap-bug-workaround
Also see: T134469: doBlockLevels() inserts <p> and </p> randomly with no regard for HTML validity