Re: diff-mode doesn't like "-c0" or "-u0" diff output for single-line changes

[Glenn Morris]

Stefan Monnier wrote:

> Thanks.  But I still wonder: why would anybody use "-c0" or "-u0"?
>
> If you don't want context, then you're better off with the plain or `ed'
> diff formats, no?

Previously, it also failed to work when either of the files being
diffed was a single line file (so there was no context to display with
plain -c or -u).