Open Ore block duplication bug.

I came across a bug (glitch?) while I was playing.
Here's how to replicate it:
Have a full inventory with enough materials to make a single block (ex, diamond block) and have some extra.
In the crafting table, put the materials in place to craft one block andput the rest back into the inventory.
You have a block ready to be crafted and a full inventory.
Shift click the block (as if to craft it and instantly move it into the inventory). Then, without moving your cursor from the block, start clicking the block. It should continue to craft the block even though there are no materials left in the crafting table.