[plt-scheme] macro stepper enhancements

On Oct 21, 2009, at 5:29 PM, Jon Rafkind wrote:

>
>>
>>> 2. Going a step back takes a long time, I guess because the entire  
>>> computation from beginning to end is re-computed? Can all the  
>>> steps be cached along the way instead?
>>
>> They are. The steps are only recomputed when you change the hiding  
>> policy. The time is being taken up by pretty-printing, coloring,  
>> clickback-attaching, etc. I'll check to see if any of the latter  
>> parts are happening outside of edit-sequences, but other than that  
>> I don't know of any way to speed it up.
>>
>
> 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.

Ryan