I'm running into an issue where I middle click my own inventory while a chest is open and it sorts the chest instead of my inventory.

Steps to reproduce:

1. Open chest
2. Middle-click on your own inventory.
3. The chest will sort instead of your inventory

GIF attached for reference:

Seems like it isn't checking to verify where your mouse curser was when you're middling clicking and just defaulting to the other inv. I'll investigate

This has been fixed in 1.7.9, via an enabled by default config option