Barter stands selling filters

[BruThoL]

For now in the barter stands rules, we can only create filters for what is bought.
Like : I sell what's in these cupboard for a q20+ stick.

Now that there are areas for the hands, it'd be great to be able to filter what is sold as well.
Like : I sell q50+ boar meat from these cupboards for a q20+ stick

Then mixing stuff in cupboards wouldn't be an issue anymore, and the storage management would be made much easier.