identify() and metafile copies under Windows XP (PR#9634)

This seems not specific to metafiles, nor even to Windows (but the use of 
Esc is specific to Rgui).  As I understand it you expected the results of 
a graphics operation you interrupted to be copied.

I don't see anything on the help page explaining what happens if you 
interrupt during identify(), so in the words of the POSIX standards I 
would expect this to be 'undefined'.  The help page does explain how to 
terminate an identify() call, and what puzzles me is why you did not do as 
it suggests.

What a 'copy' means depends on the 'from' and 'to' devices, and how you 
copy.  It seems reasonable that saving a bitmap might be different from 
copying the plot to a device at a different resolution.