Quark version r1.1-62+ (as of r1.1-63)

When trying to move stacks with Shift+LMB, the stack will, for one frame, take up an empty slot in the hotbar (or the main inventory in other cases) and then correctly merge with another stack.

The exception there is when shift-clicking from a Tinkers' Construct Crafting Table's crafting grid. The stack initially moves to the hotbar, but then stacks into an attached inventory if there is a matching item there.

This has been tested in MC 1.10.2, Forge 12.18.2.2171 (latest at time of testing) with only Quark (+dependencies) present.

FML Log: http://hastebin.com/raw/ohixogikut

Dupe of #237.