Use ol.MapBrowserEvent.EventType.POINTERDOWN

Instaed of a hardcoded string
Stop 'mouseweel' events in ol-overlaycontainer-stopevent div
Merge pull request #1931 from fredj/popup-scroll

Stop 'mouseweel' events in ol-overlaycontainer-stopevent div
Stop draw order from preventing batch reuse
Merge pull request #1932 from twpayne/fix-draw-order

Stop draw order from preventing batch reuse
Don't sort the features when renderOrder is null
Merge pull request #1933 from fredj/null-renderOrder

Don't sort the features when renderOrder is null
snapshot