[Bugs] #3968 Browse NORM: Clear URL entry icon should disappear when there is no text

[Sugar Labs Bugs]

#3968: Clear URL entry icon should disappear when there is no text
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    Reporter:  humitos      |          Owner:  humitos                    
        Type:  defect       |         Status:  new                        
    Priority:  Normal       |      Milestone:  Unspecified by Release Team
   Component:  Browse       |        Version:  Unspecified                
    Severity:  Unspecified  |       Keywords:  gtk3, 13.1.0, patch        
Distribution:  Unspecified  |   Status_field:  Unconfirmed                
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Comment(by manuq):

 Icon should be displayed instantly when user start to type.  Please make
 it exactly like the search entries we have in Sugar, see that code.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3968#comment:2>
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