Review request for 7141296: [macosx] Mouse Wheel Turn closes combobox popup

[Alexander Potochkin]

Hello

Please review the following fix:
http://cr.openjdk.java.net/~alexp/7141296/webrev.00/

the bug's description is here:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7141296

When JScrollPane can't scroll it doesn't consume the mouseWheel event
and the Swing popup gets closed,  to please AquaLaF I consume the event 
even when the scrollBar is invisible.

Another serious problem is fixed -
when the scrollBar is visible it was impossible to scroll it with the 
mouseWheel with the single turn of the wheel.
It got scrolled only if you rotated the wheel fast enough.

With this fix I set thewheelRotation property

to 1 if 0 < preciseWheelRotation < 1
and to -1 if -1 < preciseWheelRotation < 0

as expected by the Swing components

Thanks
alexp