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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.lang.lisp
Subject: Re: A Mandelbrot set generator in HG LISP
Date: Wed, 16 Apr 2025 07:40:13 -0000 (UTC)
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On Tue, 15 Apr 2025 20:03:04 -0400, Stefan Monnier wrote:

>> Turns out it’s a bit strange: you have to position the cursor *on* an
>> opening parenthesis in order for it to highlight the corresponding
>> closer, but *after* the closing parenthesis for it to highlight the
>> corresponding opener.
> 
> Actually, "point" is never "on" a character, it's always between
> characters. So in both cases "point" needs to be outside of the
> parenthesis.

Except in one case it looks like it’s on it.

> It's just that the cursor by default is a block drawn on the character
> that follows the actual placement of "point".  Try to switch to a bar
> cursor and that should be more clear.

If it weren’t for having to deal with parenthesis pileup, it could work 
from either side.