[Minor] Item Duplication leads to lost items

[Description of the issue]

Clicking on an item, parting it out, then adding the extra stack to the original one causes the entire stack to disappear.

[DETAILED list of steps to reproduce the issue AND what to look for]

1) Left-click to select an item in your inventory that's stacked

2) With the item selected and attached to your cursor, right click to place it on the current stack

3) The popup window shows up, click the OK button.

4) The amount you were taking from the stack is added to it, (A stack of 2 becomes a stack of 4) becomes unclickable, then disappears.

[Expected behaviour]

Should re-add that amount to the stack, or if it's the entire stack it should add nothing.

[Other remarks / Comments]

Placing the stack down in another inventory slot doesn't cause this issue, stack moves as normal.

Edited August 19, 201411 yr by Cthulhuite