Coordinate bug.  Ensure that block is attached to cursor when (quickly) dragged out of a non-closing flyout.
Coordinate bug.  Ensure that block is attached to cursor when (quickly) dragged out of a non-closing flyout.

R=spertus@google.com

Review URL: https://codereview.appspot.com/51770043

TechplexEngineer/blockly-old,TechplexEngineer/blockly-old