Weird popup info problem with pinned tabs

Just noticed that the small popup windows that appear when you hover in the sidewise window do strange things if you have pinned tabs. They seem to miss the 'mouse leave' event or whatever it is that usually clears them, and they end up stuck on. Reloading clears them. Sorry it's hard to describe how to replicate - open half a dozen tabs, pin 3 of them, then hover about in the tab list - you should see what I mean :)