I copied this description from Bug Id 4259296
The symptoms can be reproduced easily with
http://java.sun.com/docs/books/tutorial/uiswing/components/example-swing/TreeDemo.java
Basically, when a JTree inside a
JScrollPane is smaller than the viewport of
the scrollpane then PageUp/PageDown keys
cause a wierd redraw effect. The JTree
appears to be shrunk to its actual size
and is moved such its bottom edge
touches the bottom edge of the JScrollPane
(the gap between the two top edges
is also rendered differently - in gray).
Expanding or shrinking nodes, followed by
further PageUp/PageDown keypresses
further confuses the positioning of the
JTree.
This bug has been closed with no workaround. If somebody has a fix for this,
please let me know.
I am using JDK1.2.2.
Thanks
Neelima
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