[plt-scheme] macro stepper enhancements

From: Jon Rafkind (rafkind at cs.utah.edu)
Date: Wed Oct 21 20:09:06 EDT 2009

>> If you can't speed it up can you provide '<- step 5' ? Or something 
>> like that.
> In the macro stepper, go to Stepper | Extra options and enable "Extra 
> navigation". Then you get a text entry with the step number, and you 
> can edit it to jump around.
Ok cool. Can you make it a more prominent feature?

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