[Bugs] #3799 sugar UNSP: Truly show the "WATCH" (waiting) cursor, during the process a section-view is loaded

[Sugar Labs Bugs]

#3799: Truly show the "WATCH" (waiting) cursor, during the process a section-view
is loaded
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    Reporter:  ajay_garg                  |          Owner:  erikos                     
        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:  Unconfirmed                
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 When we click a section-view icon in "My Settings", we should "truly" be
 shown the waiting cursor, during the duration the section-view is loaded.

 Currently, the code is there to show the waiting-cursor; however it does
 not always take effect, since "realizing" the cursor would happen when the
 main-thread goes idle.

 Instead, it should be the other way around :: first let "realize" the
 waiting-cursor; after this is done, proceed forward with further actions,
 by scheduling the further-actions via "gobject.idle_add".

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3799>
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