When a scrollpane is resized smaller such that the veiw port shrinks,
a paint() call on teh content is invoked with the clip rect set to the
viewport size. This causes the child to do unnecessary repainting -
since only the view got smaller, it shouldn't have to repaint itself.

reproducible on both winNT and solaris in jdk1.1beta3.

Reproducible by:
1 cd src/share/test/awt
2 java ScrollPaneTest
3 clone bottom scrollpane with scrollbars "as needed"
4 in new scrollpane, grab scrollbars and drag a little bit so that
  the child canvas will repaint a rectangle equating the clip area
  in the paint call
5 resize the window smaller such that the viewport shrinks

Note that the child gets a paint for the entire visible region,
even though the view didn't change.