sixel support
On bugzilla there is a patch to add sixel support: https://bug729204.bugzilla-attachments.gnome.org/attachment.cgi?id=334314
The general view of this patch seemed positive, and I am hopeful it can be integrated at some point. If needed I can try to rework this patch in but I have absolutely no familiarity at all with this codebase so it would probably be better for someone else to do so.