Has there been any progress on this?
The github issue tracker (
https://github.com/splitbrain/dokuwiki/issues/924) has a single reply. However, the solution in that comment (use a negative margin in css) does not work if, like me, you use justified paragraph margins, as the size of any given piece of whitespace will vary according to the amount of text needed to fill each row's width. That person acknowledges that such a 'fix' is a kludge in any case, and that it should really be fixed in the main dokuwiki engine.
Edit: The yalist plugin seems to have been a red herring, as the core dokuwiki code doesn't have anything that looks the same (to my limited knowledge of php).