Button still highlighted after tooltip was hidden (Edge)

Bug description:

Link to minimally-working plunker that reproduces the issue:

Move cursor over the button. The tooltip is shown. Then move cursor up through the tooltip.
Actual result: Button is highlighted
Expected result: Button isn’t highlighted

Reproduced only in Edge.

Printscreen made from https://ng-bootstrap.github.io/#/components/tooltip/examples
image

Version of Angular, ng-bootstrap, and Bootstrap:

Angular: 5.2.9
ng-bootstrap: 1.1.1
Bootstrap: 4.0.0

1 possible answer(s) on “Button still highlighted after tooltip was hidden (Edge)