<Swing Dev> [12] RFR JDK-8203281:[Windows] JComboBox change in ui when editor.setBorder() is called

[Prasanta Sadhukhan]

Hi All,

Please review a fix for an issue where it is seen that combobox gets an 
unwanted border around it.
This is a aftereffect of JDK-6490753 
<https://bugs.openjdk.java.net/browse/JDK-6490753> where am empty border 
is added to combobox to make it look like Vista native combobox.
Proposed fix is to make sure no empty border is drawn if windows version 
is not vista.
Here's the combobox looks like before and after fix in windows 10 and 7.

Before fix

After Fix

Bug: https://bugs.openjdk.java.net/browse/JDK-8203281
webrev: http://cr.openjdk.java.net/~psadhukhan/8203281/webrev.0/

Regards
Prasanta
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