Overlay: No touch scrolling in ol.Overlay #5243
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Touch scrolling in an overlay is prevented by ol.pointer.TouchSource.prototype.touchmove. If the overlay has set the style properties max-height and overflow: auto, the overlay is not scrollable on touch devices (iOS, Android, Chrome Dev Tools)
Fiddle: http://jsfiddle.net/ttgo4wr0/1/
The workaround in issue #3253 doesn't apply because the position of the overlay should get moved with the map.
A fix for this issue would be to add ol.events.EventType.TOUCHMOVE in the overlayContainerStopEvents array in map.js: c5384a4