hg: jdk8/awt/jdk: 8008289: DefaultButtonModel instance keeps stale listeners in html FormView

[alexandr.scherbatiy at oracle.com]

Changeset: 4bf242def958
Author:    dingxmin
Date:      2013-02-15 15:05 +0400
URL:       http://hg.openjdk.java.net/jdk8/awt/jdk/rev/4bf242def958

8008289: DefaultButtonModel instance keeps stale listeners in html FormView
Reviewed-by: malenkov, alexsch

! src/share/classes/javax/swing/text/html/FormView.java
+ test/javax/swing/text/html/7189299/bug7189299.java