Send invite request to all participants while restoring shared session

[alsroot]

from  http://dev.sugarlabs.org/ticket/402#comment:3

A better system would actually recognize that the instance has been shared in the past, and provide the option to resume the chat, automatically inviting the former participants. In fact, this could/should be a Sugar thing (opposed to a Chat thing), by which any activity resumed gave an option (in the launcher!?) to resume it with the former participants, thus automatically sending them invitations to join. That approach prevents redundant code, limits developer hassle, and keeps the invitation step in the trusted shell.

[tomeu]

do we have a design proposal already?

[garycmartin]

This would get real annoying unless we allow users to stop sharing activities and work on them privately, or resume them directly in private mode ( http://dev.sugarlabs.org/ticket/671).

[walter]

Hopefully will be part of the collaboration push for 0.90