[Bugs] #2702 UNSP: "Invite to <activity>" shown even for activities that don't support sharing

[Sugar Labs Bugs]

#2702: "Invite to <activity>" shown even for activities that don't support sharing
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    Reporter:  sascha_silbe               |          Owner:                   
        Type:  defect                     |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.94             
   Component:  sugar                      |        Version:  Git as of bugdate
    Severity:  Minor                      |       Keywords:                   
Status_field:  New                        |   Distribution:                   
   Seeta_dev:                             |  
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Changes (by sascha_silbe):

 * cc: rgs, erikos (added)


Comment:

 We currently key the invite menu off the "active activity"
 ({{{jarabe.model.shell.ShellModel.get_active_activity()}}}, based on
 mapped X11 windows) and don't have API to query the collaboration
 capabilities of a running activity from within Sugar (the "Shell").

 Whatever API we choose, it should be compatible with non-Sugar
 applications (that get started from within Sugar, e.g. via Terminal).
 CC'ing rgs as he has done some work on making Gnome applications
 collaborate with Sugar activities.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2702#comment:1>
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