When you hover over an element that creates a tooltip and the element itself is then removed the tooltip snaps to the top left corner and remains open for eternity.
How to reproduce:
- Let someone send you a file
- Hover over the filename
- Let the other person delete the file
I also had this occur in other situations, this was just the most reliable way to reproduce it.
So I guess the fix should not be specific for filenames, but in general for all tooltips.