Re: [PATCH 11/18] branch-diff: add tests

> On Thu, May 3, 2018 at 8:30 AM, Johannes Schindelin
> <johannes.schindelin@gmx.de> wrote:
> > From: Thomas Rast <tr@thomasrast.ch>
> >
> > These are essentially lifted from https://github.com/trast/tbdiff, with
> > light touch-ups to account for the new command name.
> >
> > Apart from renaming `tbdiff` to `branch-diff`, only one test case needed
> > to be adjusted: 11 - 'changed message'.
> >
> > The underlying reason it had to be adjusted is that diff generation is
> > sometimes ambiguous. In this case, a comment line and an empty line are
> > added, but it is ambiguous whether they were added after the existing
> > empty line, or whether an empty line and the comment line are added
> > *before* the existing emtpy line. And apparently xdiff picks a different
> > option here than Python's difflib.
> 
> I think that is the fallout of the diff heuristics. If you are keen on
> a 1:1 port, you can disable the diff sliding heuristics and it should
> produce the same diff with trailing new lines.