bug#13867: 24.3.50; reading certain emails containing images in mu4e causes segfault

[Nicolas Avrutin]

Looks like something changed in imagemagick-6.8.2.0 that broke
this. imagemagick-6.8.1.9 works fine, but 6.8.2.0 and later versions
(including the latest version, 6.8.3.7) do not. The ImageMagick
changelog mentions some changes with regard to handling PNG transparency
in 6.8.2-0. As near as I can tell, the problem was introduced between
ImageMagick trunk revisions 10523 and 10826 (inclusive) and is probably
in trunk/coders/png.c, which narrows it down to revisions { 10523,
10524, 10577, 10578, 10602, 10640, 10709, 10711, 10762, 10809, 10810,
10820, 10826 }.

Unfortunately I haven't been able to get emacs to compile against the
trunk revisions of imagemagick (emacs just doesn't detect them and
builds without imagemagick support).

I suppose at this point, I think I'll file a bug at ImageMagick's bug forum.

I can send you full backtrace with the imagemagick calls if you think
it would be useful to you. Otherwise I'll just post it on the
imagemagick forum.

-- 
Nicolas Avrutin