[9] Review request 8155083: On Windows, usage of USER_ATTENTION_WINDOW depends on state setting order

[Alexander Zvegintsev]

Hello,

please review the fix
http://cr.openjdk.java.net/~azvegint/jdk/9/8155083/00/

for the issue

https://bugs.openjdk.java.net/browse/JDK-8155083

With current implementation we are showing initially iconified window 
with SW_SHOWMINIMIZED flag, it activates the window, FlashWindowEx 
doesn't work with active window.
We could use SW_SHOWMINNOACTIVE instead, but there is another issue: if 
app has more than one window it doesn't work either.
The fix it to use FlashWindow().

--
--
Thanks,
Alexander.