I observed that we collapse spaces before non-printable chars are removed, at https://github.com/metabrainz/musicbrainz-server/blob/9d8752d/lib/MusicBrainz/Server/Data/Utils.pm#L314

I assume this is how http://musicbrainz.org/edit/33190862 was entered, because /ws/js/edit trims all the track names just fine and I can't see any other way to bypass the space collapsing code. (If the problem was in the /ws/js/edit code, I think the issue would be more widespread.)