[Bugs] #4957 Sugar UNSP: While scrolling background of CellRendererIcon is rendered

[Sugar Labs Bugs]

#4957: While scrolling background of CellRendererIcon is rendered
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       Reporter:  Abrahm                     |       Owner:
           Type:  defect                     |      Status:  new
       Priority:  Unspecified by Maintainer  |   Milestone:  Unspecified
      Component:  Sugar                      |     Version:  Unspecified
       Severity:  Unspecified                |    Keywords:
Distribution/OS:  Ubuntu                     |  Bug Status:  New
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 Hover a cursor over any CellRendererIcon and try to scroll.

 Expected result:
 The background should not render.

 Observed result:
 Background of multiple cellrenderericons in the same column render.

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Ticket URL: <https://bugs.sugarlabs.org/ticket/4957>
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