<Swing Dev> [12] JDK-8213071: [macos] The focus is disappear after pressing return to close the "That was a pretty good movie!" dialog.

[shashidhara.veerabhadraiah at oracle.com]

Hi All, Please review a fix for an accessibility vpat issue.

Bug: https://bugs.openjdk.java.net/browse/JDK-8213071

Webrev: http://cr.openjdk.java.net/~sveerabhadra/8213071/webrev.00/

The behavior of the same actions to reproduce the problem, produced 
different results with VO and without VO. It have behaved right without 
the VO and with VO, the focus was lost.

The issue is with window being the KEY and MAIN window per the Mac 
windowing system. There are platform notifications like the 
'windowDidBecomeMain' and 'windowDidBecomeKey' are issued for the window 
that is about to get the focus and key strokes. So typically under 
normal conditions, the window which is about to get notified of becoming 
the focusable window would get the KEY and MAIN notifications in that 
order.

But with VO, some how the KEY notification was not delivered to java 
window and it only receives the MAIN notification. In this scenario, 
though the isKeyWindow() is true for this window, KEY notification was 
not delivered and only the MAIN notification is delivered. We do 
transfer the focus under the KEY notification handler which was not 
getting executed since it received no KEY notification. Per me, 
isKeyWindow() and MAIN notification is sufficient to transfer the focus 
and become a main window but I have not disturbed the existing handlers 
for the notification and fixed only for the case which is causing this 
issue.

Thanks and regards,
Shashi