[8] Request for review: JDK-8013611 Modal dialog fails to obtain keyboard focus

[Anton V. Tarasov]

Please, review a fix.

jira: https://jbs.oracle.com/bugs/browse/JDK-8013611
webrev: http://cr.openjdk.java.net/~ant/JDK-8013611/webrev.0
The fix refines a condition by which a focus request is directed through the branches. Please refer 
to jira for more details.

I've run reg tests on Windows/Mac.

Thanks,
Anton.