[8u60] Request for approval: 8033069: mouse wheel scroll closes combobox popup

[Alexey Ivanov]

Hello,

Could you please approve the following backport of the fix to 8u60?

JBS bug: https://bugs.openjdk.java.net/browse/JDK-8033069
Webrev: http://cr.openjdk.java.net/~aivanov/8033069/jdk9/webrev.00/
Review: 
http://mail.openjdk.java.net/pipermail/swing-dev/2015-May/004475.html

JDK9 changeset: http://hg.openjdk.java.net/jdk9/client/jdk/rev/37420463e70c

The changeset applies cleanly to jdk8 after paths reshuffling.

Thank you,
Alexey