[Bug 51248] When scrollbar_colour is set the scrollbar is offset/ out of place

[Who]

Public bug reported:

If you look at the screenshot comparing Ubuntulooks with Clearlooks-
cairo you can see that Ubuntulooks (right) doesn't render the scrollbar
as clearly as clearlooks-cairo (left) - it adds 1px of grey to the left
hadn side

** Affects: ubuntulooks (Ubuntu)
     Importance: Untriaged
         Status: Unconfirmed

** Attachment added: "Comparison of Ubuntulooks and Clearlooks-cairo"
   http://librarian.launchpad.net/3173968/ubuntulooksrender.png

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When scrollbar_colour is set the scrollbar is offset/ out of place
https://launchpad.net/bugs/51248