Fixes the almost ten-year-old issue with mouse key binds not working in inventories (see the bug report linked below).
https://bugs.mojang.com/browse/MC-577
Note:
Binding drop to mouse button 4/5 causes weird things in the creative inventory, I would recommend not doing so if you're planning on using the creative inventory.
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Make sure you get the correct jar for your mod loader and game version
