On Sat, Nov 23, 2019 at 01:02:50AM +0100, Adam Sjøgren wrote:
> 
> Note, though, how the RGB image looks different than the two others, it
> has a border added.

This is caused by the smoothing of the image. After a LOT of searching
around I found out we need to set the repeat value for the Picture to
pad so that when it’s applying the filter and looking outside the
image bounds it will look for the nearest real pixel rather than
inventing a transparent black one.

Patch attached.

> I have run Gnus in Emacs for around an hour now without any crashes,
> with this patch.

Thanks!
-- 
Alan Third