Last modified: 2011-02-01 13:14:13 UTC
When there are files with long names, the fact that the filenames have no spaces makes the other columns shrink, and as their text wraps, the whole table becomes longer than it needs to be.
Sounds like a call to ->getText() was forgotten (which returns the Textform that has _ converted to spaces.)
Already fixed in r67938 See translatewiki for instance, which is already running 1.17 http://translatewiki.net/wiki/Special:ListFiles
*** This bug has been marked as a duplicate of bug 23845 ***