Bug report: R cancels shutdown

R cancels shutdown

To replicate:

 * open R
 * shut down your computer (eg. apple menu -> shut down)
 * a dialog box appears saying "The application R cancelled shut down..."

What should happen:

 * R should get focus and "closing R session" sheet should appear, but
shut down should not be cancelled (see, eg. any other application)

GUI version: Version 1.12 (1622)

Hadley