[Client] Very minor graphic bug, items sometimes have a weird thicker border around them.

Sometimes when creating a item list in the client I notice a slightly thicker border around item icons. Moving them around in the boxes or from box to box does not help, the border stays with the item that is dragged to new positions. Removing the item and replacing it with the same item from the list of items has no effect, even if removed and then placed in a different position or box, the thicker border remains.

Switching between items sets also does not fix the borders.