<Swing Dev> RfR JDK-8154069, Jaws reads wrong values from comboboxes when no element is selected

[Pete Brunet]

Please review the following:

Bug: https://bugs.openjdk.java.net/browse/JDK-8154069
Patch: http://cr.openjdk.java.net/~ptbrunet/JDK-8154069/webrev.01/

The scenario is resetting a second combo box via setSelectedIndex(-1)
when a first combo box changes.  With the fix the selection is now cleared.

jtreg for my test case and JCK for JComboBox both ran OK.

3 of 9 JPRT build jobs failed (Mac and both Windows).  There is nothing
about the patch that should cause a build problem on those three
platforms so I assume the failures are due to some other unrelated
issue.  I'll check to see who might know what's going on with the JPRT
builds.

TiA, Pete