hg: jdk8/awt/jdk: 8013571: TreeModelEvent doesn't accept "null" for root as Javadoc specifies.

[sergey.malenkov at oracle.com]

Changeset: a0202d94844a
Author:    malenkov
Date:      2013-06-17 18:30 +0400
URL:       http://hg.openjdk.java.net/jdk8/awt/jdk/rev/a0202d94844a

8013571: TreeModelEvent doesn't accept "null" for root as Javadoc specifies.
Reviewed-by: alexsch

! src/share/classes/javax/swing/JTree.java
! src/share/classes/javax/swing/event/TreeModelEvent.java
! src/share/classes/javax/swing/plaf/basic/BasicTreeUI.java
! src/share/classes/javax/swing/tree/FixedHeightLayoutCache.java
! src/share/classes/javax/swing/tree/VariableHeightLayoutCache.java
! src/share/classes/sun/swing/SwingUtilities2.java
+ test/javax/swing/JTree/8013571/Test8013571.java