User popover immediately closed when hovering over certain areas
From the thread in #25807 (comment 222484667):
Because our popover element overlaps a bit with the target element, hovering around the edge would cause it to trigger a mouseleave
event which closes the popover. When the popover is closed, the cursor would now be over the target so it triggers another mouseenter
causing the flickering.
The area where the elements overlap also changes based on the status text of the user. When the user has no status (or maybe a short status), the flicker only happens near the arrow / pointy part of the popover.
When the user's status is Please @ me directly in comments so I see your message
like in the sample in the thread (or maybe any status that wraps into another line), the flicker happens anywhere on the user's name and there's no way to show the popover.
We should also probably consider keeping the popover open when the cursor moves from the name to the popover. It solves this problem plus I think it's a better experience. It allows selecting / copying the status text, etc..