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Re: Hl-line and visual-line

From: David Reitter
Subject: Re: Hl-line and visual-line
Date: Thu, 20 May 2010 22:35:44 -0400

On May 20, 2010, at 5:02 PM, Eli Zaretskii wrote:
>> +    (cons (progn (vertical-motion 0) (point))
>> +         (progn (vertical-motion 1) (point)))))
> This will do The Wrong Thing with bidirectional text, because
> vertical-motion puts you on column zero, which is not necessarily the
> first character after a newline, in buffer's order of increasing
> character positions (a.k.a. "logical order").  The net effect will be
> that only part of the screen line will be highlighted.
> I just yesterday fixed a similar problem in move-end-of-line (see
> revno 100369).  You need to proactively get to the line's first
> character, with either skip-chars-backward or (per Stefan's
> suggestion) `(forward-line 0)'.

These two seem applicable to buffer lines; I'm not sure how I would do it with 
word-wrap without `vertical-motion'.

Should I just use `beginning-of-visual-line' and `end-of-visual-line'?

On another note, I first thought of just implementing hl-line in the redisplay 
code, or perhaps as an option to the cursor display.  When the cursor is drawn, 
we just highlight the line.  No moving around overlays in Lisp...

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