Created attachment 135486 [details]
The problem with instant tooltip switching
Add a few ms between tooltip switching so that the tooltip doesn't immediately switch when accidentally hovering other icon while trying to reach the tooltip diagonally. This issue is more pronounced with more window in the group. Instead of naturally reaching the tooltip diagonally, user has to move the cursor up, then towards the desired window. Adding some short delay would fix that, though I understand that many user would not like the delay because it would feel annoying or sluggish, so I think the best option is to make it configurable.
*** This bug has been marked as a duplicate of bug 358930 ***