RE: highlight-indent-guides in display engine

[Drew Adams]

> But also there is not any answer/suggestion about what to do with the
> irregular indentation in Lisp...

Since you've asked that a couple times now,
here's my take on it.

It's not at all _needed_ for Lisp.  And personally
I wouldn't find it useful for Lisp.

Lisp has simple syntax - it's sufficient to
balance parens.  Automatic and on-demand
indentation work off of that syntax.

And most Lisp code does not have many-line
stretches with a large indentation, so you don't
often need to worry about line-of-sight alignment.
And checking column number is easy enough for any
exceptional cases.

Many other languages are different.  For them I
can see how it could be useful for some users.

Just one opinion.