[racket] online check syntax error display tweak

From: Matthias Felleisen (matthias at ccs.neu.edu)
Date: Fri Sep 9 12:07:26 EDT 2011

On Sep 9, 2011, at 12:05 PM, Vincent St-Amour wrote:

> At Fri, 9 Sep 2011 10:58:23 -0500,
> Robby Findler wrote:
>> I thought about that, but I didn't want it to overlap the text and I
>> didn't want it to slide everything over to make space.
> What about horizontal lines before and after the relevant line,
> running across the whole editor. Finding the relevant code becomes a
> matter of following the lines. Grant Rettke's IntelliJ screenshot does
> something similar, and I think it helps.

The lines there look like method separators (possibly collapsible 
method cells in the editor). 

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