Tooltip in trading is covered by no trade icon

Put the summary of the bug you're having here

What I expected to happen was...:
I thought that the tooltip would be above the no trade icon

What actually happened was...:
The tooltip was covered by the no trade icon

Steps to Reproduce:
1. Trade with a village until he doesn't want to trade that item anymore.
2. Put an item in the trade slot.
3. Hover over it so that it overlaps with the no trade icon
4. ???
5. Bug found!