[Bugs] #3962 sugar-artwork UNSP: GTK3 treeview root item styled with rounded corners

[Sugar Labs Bugs]

#3962: GTK3 treeview root item styled with rounded corners
------------------------------------------+---------------------------------
    Reporter:  garycmartin                |          Owner:  manuq      
        Type:  defect                     |         Status:  assigned   
    Priority:  Unspecified by Maintainer  |      Milestone:  0.98       
   Component:  sugar-artwork              |        Version:  0.97.x     
    Severity:  Unspecified                |       Keywords:  13.1.0     
Distribution:  Unspecified                |   Status_field:  Unconfirmed
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Comment(by manuq):

 Adding this to the CSS makes the header square again.  Note the change in
 the header selected.  Previously we had round corners for the selected
 state, like a button, and the same background color in the cage that
 contained it.

 {{{
 column-header .button {
     border-radius: 0px;
 }
 }}}

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3962#comment:2>
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