Abandoning Changes

I quite often get to the point where I have made a number of changes to a working show file, sometimes just to experiment. EOS lets me know with an asterisk of course. Now I really want to get rid of all my changes. My current practice is to pull up another show file and make sure I do not save changes in the one I'm closing. Just wondered of there was another  way to dump all the changes since the file was opened?

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