Fixed items duplicating when moving the mouse wheel quickly and swapping. Offhand swaps are now not done on the client side, and the client must wait for a server response to be able to swap again. Inventory Tweaks now properly works with swapping as well.

Previous changes/additions from unstable 1.1 versions:

New features:

• Added a slot to the inventory where the offhand item can be placed. This is configurable! If experiencing compatibility issues, try disabling this feature.
• Et Futurum's totem of undying now works in the offhand.
• Added JinRyuu's mods compatibility for rendering an emtpy offhand.
• If using an axe in the mainhand and a log is highlighted, the mainhand action takes precedence. Same for shovels & dirt.
• Updated ingame mod info, rendering an empty offhand is now configurable from the mod menu.

Bug fixes:

• Fixed items not breaking in the offhand.
• Fixed offhand item being moved back into the main inventory on login when empty offhand use is disabled.
• Fixed items moving around in the hotbar when moving an item into the offhand while InventoryTweaks is installed.
• Fixed offhand items vanishing on pickup in survival mode if the player's inventory is full.
• Fixed some items vanishing on offhand use.
• Fixed not being able to attack with an empty offhand
• Fixed being able to break blocks behind an entity being attacked with the offhand.

Visual Fixes:

• Fixed offhand and sometimes even mainhand clipping through blocks when using Optifine.
• Fixed right hand's lighting being disabled.
• First person offhand is now rendered directly after the mainhand renders.
• The offhand item no longer shows up on the first main hotbar slot while in creative mode's survival inventory GUI.
• Fixed inventory GUI darkening when eating or drinking with the offhand.