[7u10] Please review fix for 7171812: [macosx] Views keep scrolling back to the drag position after DnD

[Alexander Zuev]

Hello,

  please review my fix for CR 7171812: [macosx] Views keep scrolling 
back to the drag position after DnD

  The reason is that we are wrongly issuing an dragEntered event when 
we start dragging where drag source and drop target is the same 
component. It is enough to change the initialization of the insideTarget 
variable to safely prevent that from happening.

Bug description is: 
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7171812
Webrev can be found here: 
http://cr.openjdk.java.net/~kizune/7171812/webrev.00

With best regards,
Alex