Comment #19 on issue 2790 by [email protected]: Patch: bar-line interface part 2/2
http://code.google.com/p/lilypond/issues/detail?id=2790
With this new patch set, the tiny gap that occured at span bars (for example with \bar "|.") is removed. I am not sure whether this was a known issue, but Harm draw my attention to it. You'll need Adobe Reader or some pdf viewer with 1000% zoom to see the gap (in master).
