bug#36403: 27.0.50; Trivial image.c bugs

[Pip Cet]

On Thu, Jun 27, 2019 at 5:40 PM Eli Zaretskii <eliz@gnu.org> wrote:
> > From: Pip Cet <pipcet@gmail.com>
> > Date: Thu, 27 Jun 2019 16:28:05 +0000
> >
> > I think with the exception of the contrived last example, these are
> > all easy to fix, but a bit harder to fix well. I've tried to do the
> > former, for now, but I'd welcome any help for me to do the latter.
>
> Thanks, but please also add tests which verify that these problems no
> longer happen after the fix.

Thanks for reminding me of that! I looked into that, and it seems
there are no image tests so far.

Attached patch has tests and fixes.

0001-Fix-minor-bugs-in-image.c.patch
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