When DataLayer._dataloaded is set, DataLayer.addLayer will send 'datachanged'
event (for once for each feature). When the data browser panel is open, the
browser is listening to 'datachanged' to rebuild itself.
Not sure this is the real final fix, but that may need more refactoring, so
I think this approach is already a better situation than the current.
fix#1457
uMap lets you create maps with OpenStreetMap layers in a minute and embed them in your site.
Because we think that the more OSM will be used, the more OSM will be improved.
Built on top of Django and Leaflet.