OpenLayers.Layer.GeoRSS markers should correlate to original feed

[openlayers]

This is a follow on to bug #1742.

Currently the OpenLayers.Layer.GeoRSS class uses the OpenLayers.Format.GeoRSS class to parse a GeoRSS XML document and produce an array of Vector features which contain "fid" and "link" properties. Without subclassing and duplicating a lot of code, there is no clean way of correlating a marker on the map with the original RSS feed.

If the "fid" and "link" were maintained from the OpenLayers.Format.GeoRSS feature to the OpenLayers.Layer.GeoRSS feature, we could relate all information properly.

The reason we want to do this is that we want to maintain the new/old/read icon each time the feed is reloaded. In the future this could also be used to more intelligently update the layer when a feed is reloaded such that only the necessary markers were removed thus avoiding flicker.

[edgemaster]

I believe the correct response to this is that as of 2.7, Layer.GeoRSS will be decrepated, in favour of the new 'Vector Behaviour' model, based on a Format, Strategy, Protocol model.

[crschmidt]

Not touched in 2.7; bumping.