Buffer batch group extent
Handle vector layer opacity
fixup! Add initial canvas implementation of replay API
Add ol.style.stroke.equals
Avoid stroke state changes
Implement ol.replay.canvas.BatchGroup#isEmpty
Add ol.replay.IBatchGroup#finish
Precalculate more instructions
Export ol.source.Vector
Export ol.source.GeoJSON
Export ol.source.Vector
Re-use batches when animating or interacting