[Bugs] #1646 UNSP: No way to force-close (kill) an activity

[Sugar Labs Bugs]

#1646: No way to force-close (kill) an activity
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    Reporter:  sascha_silbe               |          Owner:  tomeu                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  Git as of bugdate          
    Severity:  Major                      |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  New                        
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 If an activity has gotten into a state where it doesn't close itself
 anymore, there's no way for the user to do a clean shutdown (the only
 option left is forcibly powering off the machine).
 Several other UIs are offering to forcibly close an application if it
 doesn't voluntarily close after a certain amount of time. Another option
 is offerring the option to kill the application in the regular menu (like
 e.g. ion3 does), but IMO the first option is better since it's harder to
 accidently shoot yourself in the foot.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1646>
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