Inventory only partially updating on Client

[Faithcaio]

This is a small Testplugin i wrote to track down the issue:
http://pastie.org/private/h9vsite5c9qsfgvjjp75dw

To reproduce:

• right-click on a block.
• right-click on a block with at least 2 books in hand
• books get replaces with enchanted book but the others won't show
  • until you interact with the first "empty" inventory slot

This does not happen when using InteractBlockEvent.Primary instead.

[catageek]

Another example: Remove an item with Slot.clear(), the item will be shown until we interact with it.

[Zidane]

@Grinch tested both of these issues and wasn't able to reproduce this. Reopen if still an issue.