[plt-scheme] excessive refresh

From: John Clements (clements at brinckerhoff.org)
Date: Tue Oct 28 14:50:54 EDT 2008

On Oct 28, 2008, at 11:32 AM, Dave Herman wrote:

>> How do I reproduce this? I use Windows XP.
> Take the following code and add the parens needed to finish the  
> definition of foo. After each paren you'll see the screen flash  
> several times in a row.
> (define foo
>  (let ([abc 123])
>    (let ([def 123])
>      (let ([ghi 123])
>        (let ([jkl 123])
>          (let ([mno 123])
>            (let ([pqr 123])
>              'abcdefghijklmnoqpr)
> If you make bigger regions you notice the flashes even more.

FWIW, on OS X 10.5 PPC I see flashes occasionally when doing what you  
describe here; in a very mildly scientific experiment, I added all of  
the parens and then deleted them five times as fast as I could with  
the search bar open, and observed two flashes total. Nothing to write  
home about.


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