Neighbourhood shared Activity title re-named by someone else re-joining

[garycmartin]

Sharing a named Chat Activity on jabber.sugarlabs.org, after several others had joined and left again, I noticed from the 2 machines I was testing Sugar with that they both now showed the Neighborhood Chat icon with a different title, not one I had set when first sharing. I didn't think renaming an already shared Activity was possible, so not sure if this really is a defect or a hidden feature.

FWIW: Renaming has the potential for abuse as those already in the shared session can't tell that the name was changed on them. It would be an reasonable feature if the name change could be clearly indicated to all the participants when it happens and by whom (perhaps an inline Activity Alert).