bug#25410: 26.0.50; Refine an unified diff hunk only if adds lines

[Noam Postavsky]

On Fri, Jan 13, 2017 at 1:14 AM, Tino Calancha <tino.calancha@gmail.com> wrote:
>
>> +         (while (re-search-forward "^-" end t)
>> +           (let ((beg-del (progn (beginning-of-line) (point)))
>> +                 beg-add end-add)
>> +             (when (and (diff--forward-while-leading-char ?- end)
>> +                        ;; Allow for "\ No newline at end of file".
>> +                        (progn (diff--forward-while-leading-char ?\\ end)
>> +                               (setq beg-add (point)))
>> +                        (diff--forward-while-leading-char ?+ end)
>> +                        (progn (diff--forward-while-leading-char ?\\ end)
>> +                               (setq end-add (point))))
>
> How about hide the complexity resulting for checking ?\\ inside the
> auxiliary function?

I'm okay with doing this, but I slightly prefer leaving the complexity
at the top level. I think pushing the ?\\ check inside
diff--forward-while-leading-char makes that function's purpose a bit
incoherent and the complexity reduction in the caller doesn't look
significant enough to balance that.