hg: openjfx/8/controls/rt: fix RT-24505 Menu.setOnShowing called on menu hidden

[hang.vo at oracle.com]

Changeset: 6a8f1341dabc
Author:    Paru Somashekar <paru.somashekar at oracle.com>
Date:      2012-08-30 10:35 -0700
URL:       http://hg.openjdk.java.net/openjfx/8/controls/rt/rev/6a8f1341dabc

fix RT-24505 Menu.setOnShowing called on menu hidden

! javafx-ui-controls/src/javafx/scene/control/Menu.java
! javafx-ui-controls/test/javafx/scene/control/MenuBarTest.java