Don't know who has to implement this: Draylar/inmis#13

Inventory sorting does not detect the backpack as an inventory, perhaps because he’s using spinners rather than a vanilla GUI. This is an issue on my end, I’ll take a look when I get the time

I've got this mostly working, just need to tidy it up before release. Issue actually wasn't that backpacks weren't being detected, but rather spinnery was nuking vanilla functionality in it's guis(and containers) that inventory sorter required. Right now I've just got a few mixins to spinnery to restore that functionality but i'm wondering if these changes should be made to spinnery instead(as I’m sure this won’t be the only mod incompatible with spinnery). I really don't want to have to hardcode support for every mod

I’ve also noticed that rei doesn’t display in spinnery guis perhaps due to the same issue

I am guessing spinnery is the lib used to display the inventory in the backpack. Yes, it has many issues. Some of them posted in the inmis github. Probably they should be fixed there, including this one.