A patch I just looked at on bugzilla had a deleted line that just contained "-->", which translates into "--->" in the patch (the extra initial "-" meaning "deleted") This line was completely ignored by Bugzilla's "diff viewer" -- it's not displayed at all. This was on https://bugzilla.mozilla.org/, which is currently running "version 3.0.3+" of bugzilla.

If you look directly at the example patch here... https://bugzilla.mozilla.org/attachment.cgi?id=317389 you'll see that it removes a line with the contents "-Here's a line beginning with a dash." However, this line isn't shown at all in the "diff view" here: https://bugzilla.mozilla.org/attachment.cgi?id=317389&action=diff It should appear on the left side of that diff viewer, between "Blah blah blah." and "foo bar".

V.Duplicate