PointerMove Interaction styles flicker when layers option is specified

[Distem]

Styles in select Interaction for pointerMove seems to flicker on/off when you keep moving the mouse over the same item. This only happens if the layers option is specified.

See fiddle: http://jsfiddle.net/6ysd6s2q/6/

[ahocevar]

Should be fixed with #4613.