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But, to answer your very legitimate question, as far as i know Photoshop is not intelligent enough to tell you the size of an object in an otherwise-transparent layer. Seems like a pretty reasonable favor to ask of it though, right?
Make sure that you replace the selection to its original position before exiting by using command-down arrow or you will have permanently moved the selection up 1 pixel
good shortcut, however I must mention one thing:
On a Mac it's not the control key, it is the command key also kown as the apple or cloverleaf key. The control key is like using right-click on a pc.
But I must confess that having used PS for about 10 years I did not know if this short cut .... thanks!