[Bugs] #1490 UNSP: home screen: "start new" behaviour not reset if non-<alt> modifier active while releasing <alt>

[Sugar Labs Bugs]

#1490: home screen: "start new" behaviour not reset if non-<alt> modifier active
while releasing <alt>
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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:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  New                        
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 Steps to reproduce:
 1. Enter home screen (ring layout)
 2. Press and hold <alt>
 3. Press and hold <shift>
 4. Release <alt>
 5. Release <shift>
 6. optional: click on any activity icon that was previously colored (i.e.
 has existing sessions in the Journal)

 What I expected:
 Either don't change behaviour at all if <shift> is active (in addition to
 <alt>) or reset the state once <alt> has been released.

 What happened:
 "Start new" behaviour was "stuck", i.e. activity icons remained uncolored
 (even after releasing <shift>) and after clicking on one of them a new
 instance is started (instead of resuming an existing one).

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1490>
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