Hi All,
Bug: https://bugs.openjdk.java.net/browse/JDK-8191639
It is seen that when JList.locationToIndex() or getCellBounds() is
overridden to return -1 or null respectively,
it causes NPE when PageUp/PageDown is pressed in JList.
From the spec
[https://docs.oracle.com/javase/9/docs/api/javax/swing/JList.html#getCellBounds-int-int-]
of getCellBounds(), it is seen that it can return null under some
circumstances. But, JList jdk code assumes it is always non-null.
Proposed fix is to check for null return value of getCellBounds() and
bail out.
webrev: http://cr.openjdk.java.net/~psadhukhan/8191639/webrev.00/
Regards
Prasanta
