[Bugs] #4238 sugar-toolkit-gtk3 UNSP: Sliders hard to handle with touch

[Sugar Labs Bugs]

#4238: Sliders hard to handle with touch
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    Reporter:  erikos                     |          Owner:  erikos                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-toolkit-gtk3         |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:  triage                     
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 Steps to reproduce:

 - use the sliders with touch in the brush property Palette

 ---> the usage is not pleasant, using the knob to adjust is not easy to
 trigger, feels rusty.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4238>
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