hg: jdk8/awt/jdk: 8015500: Prevent sending multiple WINDOW_CLOSED events for already disposed windows

[anthony.petrov at oracle.com]

Changeset: d378104e52e3
Author:    anthony
Date:      2013-06-03 16:27 +0400
URL:       http://hg.openjdk.java.net/jdk8/awt/jdk/rev/d378104e52e3

8015500: Prevent sending multiple WINDOW_CLOSED events for already disposed windows
Reviewed-by: anthony, serb
Contributed-by: Jose Luis Martin <jlm at joseluismartin.info>

! src/share/classes/java/awt/Window.java
+ test/java/awt/Window/WindowClosedEvents/WindowClosedEventOnDispose.java