[9,8u] review request: 8132897: ComboBox hangs on Windows 10 when clicked while not in focus

[Kevin Rushforth]

Chien and Pete,

Please review:

https://bugs.openjdk.java.net/browse/JDK-8132897
http://cr.openjdk.java.net/~kcr/8132897/webrev.00/

Details are in the bug report.

Thanks.

-- Kevin