Summary:
I often scroll with keyboard with cursor being somewhere on the screen.
Popping hovercards under the cursor is quite distracting.
Test Plan:
It works like I want in Firefox.
There's surprisingly no flickering even though I expected some.
It works like before in Chrome, perhaps it sends mousemove events anyway?
Reviewers: AnhNhan, epriestley
Reviewed By: epriestley
CC: aran, Korvin
Differential Revision: https://secure.phabricator.com/D5632
7e93e9fbe9