See this attachment here:
As you can see, both the coloured and the processed unified patch have problems with the lines starting in "-----" in the original file. I guess this is due to some confusion with the "---" introducing the fist input file of an unified patch. If that is the case, maybe you should rather check for "--- ", i.e. make the space character part of the search pattern.
I don't see a problem tbh, don't use the "diff" feature. Anyway, if it can be fixed, it needs to be fixed upstream anyway. You should file a bug at bugzilla.org. Keep in mind that we use version 2.22 and 3.2 is now released. bug #213782
Issue is known upstream: https://bugzilla.mozilla.org/show_bug.cgi?id=233695
Still present in latest CVS version. Sorry I didn't look upstream first.
Seems to come from a bug in PatchReader perl module. I can't reach the perl issue tracker atm, so I don't know what details might be available on
Would this issue here be better off closed as UPSTREAM?