Markers been hijack if it's under infobox

[BenasP]

Version

from 2.0.11 to 2.3.3

Test Case

http://plnkr.co/edit/20GtZp?p=preview

Steps to reproduce

Hover over top left marker until info box appears, without any clicking move mouse to the right bottom marker and notice that infobox opened in different location

Expected Behavior

If markers are under infobox it shouldn't override infobox location

Actual Behavior

If markers are under infobox it overrides infobox coordinates