[9] Review request for 8160248 Dragged internal frame leaves artifacts for floating point ui scale

[Alexandr Scherbatiy]

Hello,
Could you review the fix:
  bug: https://bugs.openjdk.java.net/browse/JDK-8160248
  webrev: http://cr.openjdk.java.net/~alexsch/8160248/webrev.00

  SunGraphics2D.hitClip() does not guarantee that it returns false for 
non-intersected areas.
  This exactly happens for rectangles when floating point scale is 
used. See discussion:
http://mail.openjdk.java.net/pipermail/2d-dev/2016-June/007076.html

  The proposed fix directly checks the graphics clip and component 
bounds intersection.

 Thanks,
 Alexandr.