#2239 NORM Untriag: need notify callback when switching from activity to home

[Zarro Boogs per Child]

#2239: need notify callback when switching from activity to home
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 Reporter:  erikb        |       Owner:  marco    
     Type:  enhancement  |      Status:  new      
 Priority:  normal       |   Milestone:  Untriaged
Component:  sugar        |     Version:           
 Keywords:               |    Verified:  0        
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 Related to #2026...

 Need to be notified when switching to/from the Home zoom level.

 (b/c we need to be able to turn off the camera).

 Would be nice to have this callback be the same as notify::active.

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Ticket URL: <http://dev.laptop.org/ticket/2239>
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