review request: focus disappears with shift+tab on dialogue having a focus component

[mikhail cherkasov]

Hello all,

Could you please review the following fix:
https://bugs.openjdk.java.net/browse/JDK-8031075
review request: focus disappears with shift+tab on dialogue having a 
focus component
http://cr.openjdk.java.net/~mcherkas/8031075/webrev.00/ 
<http://cr.openjdk.java.net/%7Emcherkas/8031075/webrev.00/>

Jdk8 already has it, also it was in jdk7 too, but was mistakenly 
reverted by other fix, so
I'm just returning it back.


Thanks,
Mikhail.