This bug report covers two separate, but related, issues with Swing's GTK L&F:

  1) The trough of JSlider is rendered unlike native for certain themes like Human,
     which will highlight the left part of the trough up to the point where the
     thumb is located (with an orange color); this was first reported in umbrella
     bug 6417110.

  2) JScrollBar thumbs under the Human (ubuntulooks) theme do not match their
     native equivalents when positioned at the beginning or end of the scrollbar
     "track". The JScrollBar thumb will have an extra one-pixel line between the
     "thumb" and the scrollbar button, whereas native scrollbars do not exhibit
     this behavior.

Use the attached JavaWidgetFactory testcase to compare the Swing behavior against
the native behavior in the attached "twf" application.