Clicking and dragging MOUSE3 (Mouse wheel) over item slots incorrectly attempts to place full stacks in survival

I've never seen that before, mainly because I have not used pick block while crafting. It seems that the Count data tag of the block is being changed. it is very likely unintended, and you should be using right click while spreading items.
What is happening is it places 64 wood planks on the crafting table, then subtracts 64 from the count data tag of the planks you are holding; if you have 2 wood planks and spread them, the number shows up as 2-2*64, which is -126. you can also only spread these items as many times as the number in the stack. The number you see ranges from n-2*64 to n-n*64.
A simple fix would be removing the ability to use middle click and spreading blocks, since the right button and spread already works just fine.

This is still an issue in 1.8.

This only happens in creative mode. Confirmed for 1.8.1-pre4.

edit: Well, in survival it happens as well, but the duplicate stacks disappear when you let go of the mouse.

still existing........

Still existing in 1.8.2-pre6

In creative mode it creates extra stacks of the item, in survival they just don't split up.
@anybody saying to just use right click, middle click didn't do the same thing as right click does. Middleclick+drag evenly split up the items over the spaces you hovered over. Its much easier to craft many things like a stack of stone into a stack of stonebricks, just middleclick+drag over four spaces and it puts 16 in each.

@Max
You can use the left mouse button to split a stack evenly, too.
I'd actually like it, when the MMB would split all available items of this kind - but that'd kind of a feature request...

Still a problem..

Confirmed for

• 1.8.4 for creative for count < 64, else see MC-76899. And not only for crafting fields but anywhere in some kind of inventory

You can only "fill" the first field where you started dragging MOUSE3. When releasing it, at this field the number changes to 64 (from the original count of the held items)

There are two separate issues here. One is that dragging with mouse3 is attempting to place full stacks in survival (it's intended in creative). The other is that the block count goes negative, which happens in both creative and survival.

Confirmed for 1.9.3-pre2.

Confirmed for 16w21b and 1.9.4.

Confirmed for 1.10.

Interesting observation - you can only middle-click drag into as many slots as the item originally was stacked to (IE, if you start with a stack of 3, you can only drag into 3 slots, and it'll display you as having -189 items). This includes dragging into slots that are already full of the same item, although it won't count down there.

@unknown, this limitation is indeed strange because it applies to Creative mode as well and there you have an unlimited amount of items anyways.

@unknown, it's MC-58812

The negative number portion ([MC-76899]) has been fixed in 16w32b, though the rest of the bug still exists.

The purpose of this operation appears to be evenly splitting items of a stack across the dragged-over slots, apparent from the limit of slots the items can be dragged over. Seeing 5 items cannot be split over 6 or more slots.

But it is re-used (now that we have the left-click drag for that), for the purpose of creative filling slots instead. In survival the effect is that the items cannot be duplicated and ghost items will temporarily appear during the drag.

Also, confirmed for 18w48b