As promised, I finished up item stacking and inventory dragging and combining. Most of the UI is still absent, so it's somewhat limited in what you can do with it, but all the code is there to make it work. That means items are fully implemented into the new client! Tomorrow I'll work on some UI that's missing: the multi-context menu (when you right-click on a tile with multiple things you can interact with), container inventory, and equipment.

(video snipped for dev sanity)