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See entry 84 here: http://www.javalobby.org/forums/thread.jspa?messageID=92147247� Apparently IDEA does it this way. Sounds like a good idea to me; I know some work is being done on this action anyway for 6.0.
This is definitely a usability thing. IDEA allows you to repeatedly hit cmd-/ and comment out multiple lines. This is much simpler than first selecting all the lines and then hitting the shortcut. Also, consider the cases where you want to comment a few lines, then leave a few and then comment a few. In IDEA this just go to the starting line and hit cmd-/ until you reach the first line to leave, hit the arrow key until you reach the next line to comment, then hit cmd-/ again.