FeatureLayer.deleteFeature doesn't permanently remove feature

[patrickarlt]

After calling featureLayer.deleteFeature(featureId); the feature is initally removed from the map but subsequent zooms/pans will add the feature back to the map.

The feature needs to be removed from the map and delete this._layers[id]; should permanently delete the feature from the client side cache.

This can be worked around by delete featureLayer._layers[id]; in the callback.