Several related bugs that stem from a diff that
contains both deletions and additions. Specifically,
the line numbers aren't counted correctly, leading
to
- issue URL can't be inserted because it can't find
the right line in the latest file
- generated issue references the wrong line number
- closed issue references the wrong line number
See GitHub issue #236
The last item might not have any actual impact as
(I think) it's just informational. But it'd still
be better if it reported the correct line number
of the deletion, which necessarily has to be
relative to the _old_ file's line number, not the
updated file's.
As there is no solution in place yet for these
bugs, the unittest is marked as an expected failure
