From: Michael Heerdegen <michael_heerdegen@web.de>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 21012@debbugs.gnu.org
Subject: bug#21012: 25.0.50; eww: last char of a line sometimes not fully visible
Date: Fri, 10 Jul 2015 21:19:18 +0200 [thread overview]
Message-ID: <87h9pbzuq1.fsf@web.de> (raw)
In-Reply-To: <837fq7c0n6.fsf@gnu.org> (Eli Zaretskii's message of "Fri, 10 Jul 2015 21:45:17 +0300")
Eli Zaretskii <eliz@gnu.org> writes:
> > Can't we find the position of the last completely visible char of a
> > line with
> >
> > --8<---------------cut here---------------start------------->8---
> > (save-excursion
> > (let ((truncate-lines nil))
> > (when (line-move-visual +1 t)
> > (backward-char 1))
> > (point)))
> > --8<---------------cut here---------------end--------------->8---
>
> I'd prefer to exchange ideas rather than code that I need to second
> guess. So what's the idea behind this?
>
> Is the idea to turn off truncate-lines and thus avoid partially
> visible characters at end of line?
I thought this is obvious.
> If so, how do you find the last visible character? Doing what you
> suggest above won't work with bidirectional text, where (backward-char
> 1) from the leftmost character of a visual line doesn't necessarily
> put you on the last character of the previous visual line. I think
> you need to let-bind visual-order-cursor-movement to t and invoke
> left-char instead.
Ok.
> Next, line-move-visual will only move to the leftmost character of the
> next line if you are already on the leftmost character of the current
> line, so you'd need to make that happen first. Not hard to do, but
> should be part of the code, or maybe I'm missing something.
I missed that because I always have goal-column -> 0.
> Finally, portions of line-move-visual and its subroutines only work
> when the line is visible in some window, so won't that again hit the
> same limitation of posn-at-point?
I don't know. That's why the last sentences in my message were
questions.
But are you sure that `vertical-motion' does not hit that limitation?
For example, AFAIK `vertical-motion' stops at the end of a visual line
if the first arg is a cons cell with COLS larger than available cols in
the line. How does that work when that line is not displayed somewhere?
Michael.
next prev parent reply other threads:[~2015-07-10 19:19 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-08 18:10 bug#21012: 25.0.50; eww: last char of a line sometimes not fully visible Michael Heerdegen
2015-07-08 20:03 ` Eli Zaretskii
2015-07-08 20:24 ` Michael Heerdegen
2015-07-09 2:38 ` Eli Zaretskii
2015-07-09 11:01 ` Michael Heerdegen
2015-07-09 14:43 ` Eli Zaretskii
2015-07-09 19:42 ` Michael Heerdegen
2015-07-09 15:34 ` Eli Zaretskii
2015-07-09 20:06 ` Michael Heerdegen
2015-07-10 6:03 ` Eli Zaretskii
2015-07-10 12:55 ` Michael Heerdegen
2015-07-10 13:06 ` Eli Zaretskii
2015-07-10 14:16 ` Michael Heerdegen
2015-07-10 14:43 ` Eli Zaretskii
2015-07-10 18:04 ` Michael Heerdegen
2015-07-10 18:45 ` Eli Zaretskii
2015-07-10 19:19 ` Michael Heerdegen [this message]
2015-07-10 19:31 ` Eli Zaretskii
2015-07-11 12:02 ` Michael Heerdegen
2015-07-11 13:45 ` Eli Zaretskii
2015-07-20 16:33 ` Michael Heerdegen
2015-07-20 16:34 ` Eli Zaretskii
2015-07-21 18:49 ` Michael Heerdegen
2015-09-25 4:00 ` Katsumi Yamaoka
2015-09-25 14:45 ` Michael Heerdegen
2015-09-28 21:30 ` Michael Heerdegen
2015-09-29 5:37 ` Eli Zaretskii
2015-10-03 8:08 ` Michael Heerdegen
2015-10-03 9:42 ` Eli Zaretskii
2015-10-03 12:41 ` Michael Heerdegen
2015-10-04 6:31 ` Michael Heerdegen
2015-10-04 7:09 ` Eli Zaretskii
2015-10-04 7:11 ` Michael Heerdegen
2015-10-04 7:39 ` Michael Heerdegen
2015-10-04 8:49 ` Eli Zaretskii
2015-10-04 10:18 ` Michael Heerdegen
2015-07-08 20:31 ` Michael Heerdegen
2015-10-07 6:34 ` bug#21012: Close Michael Heerdegen
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