Normally when you pick an item from the tool bar you should be able to clear the cursor by pressing Q (or the key you have assigned).
However there is a special case when this does not work. All of these conditions must be met:
- The inventory is full (the toolbelt does NOT have to be).
- The inventory does not contain the item you have selected.
- There is more than one stack of the itemthat is selected in the toolbelt.
- The stack that is selected does not have the maximum stack size, all other stacks do have the maximum stack size.
Steps to reproduce:
- Fill up your inventory.
- Place more than one stack of the same item in the toolbelt and remove some items from the last stack.
- Pick up that last stack.
- Try to clear the cursor using the Q key (or the key you have set in the controls). It will not work.