From: Alan Mackenzie <acm@muc.de>
To: Eli Zaretskii <eliz@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: "... the window start at a meaningless point within a line."
Date: Tue, 27 Oct 2015 13:46:25 +0000 [thread overview]
Message-ID: <20151027134625.GB2401@acm.fritz.box> (raw)
In-Reply-To: <20151019191522.GI2438@acm.fritz.box>
Hello, Eli.
On Mon, Oct 19, 2015 at 07:15:22PM +0000, Alan Mackenzie wrote:
> On Mon, Oct 19, 2015 at 04:27:38PM +0300, Eli Zaretskii wrote:
> > > Date: Mon, 19 Oct 2015 13:11:58 +0000
> > > Cc: emacs-devel@gnu.org
> > > From: Alan Mackenzie <acm@muc.de>
> > > > > I'm only really looking at the problem of getting to the correct
> > > > > beginning of line. Moving to a specific column (with a cons argument to
> > > > > vertical-motion) seems to be less of a problem.
> > > > If that's in a continuation line, you have the same problem: the
> > > > display engine and the move_it_* functions count coordinates and
> > > > columns from their BOL, not from your "actual" BOLs.
> > > That's not what I see. Having set `it' in Fvertical_motion to an
> > > iterator based at WS, the column movement remains based on `it', i.e.
> > > based on "actual" BOLs.
> > When move_it_by_lines returns, you are on the goal line, at zero X
> > coordinate. That zero is in "xdisp coordinates".
> OK, I see it. There's a "move_by_lines (it, -1)" near the end of
> maybe_move_to_exact_bol. Usually, this would be OK, since we'd be
> dealing with "common" BOLs rather than "actual" BOLs, but there might be
> a borderline case where `it' would need to go up to the last "actual"
> BOL. I'll need to look at this.
This "move_by_lines (it, -1)" isn't a problem, since the condition for
it occurring ensures it is only executed when starting from a "common"
BOL later than the first common BOL.
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2015-10-27 13:46 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-30 20:45 "... the window start at a meaningless point within a line." Alan Mackenzie
2015-10-01 8:48 ` Eli Zaretskii
2015-10-01 9:41 ` Alan Mackenzie
2015-10-01 10:16 ` Eli Zaretskii
2015-10-01 11:02 ` Alan Mackenzie
2015-10-01 12:03 ` Eli Zaretskii
2015-10-01 16:35 ` Alan Mackenzie
2015-10-15 18:16 ` Alan Mackenzie
2015-10-15 20:14 ` Eli Zaretskii
2015-10-16 9:55 ` Alan Mackenzie
2015-10-16 10:19 ` Eli Zaretskii
2015-10-16 15:19 ` Alan Mackenzie
2015-10-16 17:26 ` Eli Zaretskii
2015-10-16 20:46 ` David Kastrup
2015-10-17 7:15 ` Eli Zaretskii
2015-10-17 7:56 ` David Kastrup
2015-10-16 21:14 ` Alan Mackenzie
2015-10-16 17:35 ` Eli Zaretskii
2015-10-16 18:12 ` Alan Mackenzie
2015-10-16 18:23 ` Eli Zaretskii
2015-10-16 18:36 ` Eli Zaretskii
2015-10-16 20:12 ` Alan Mackenzie
2015-10-17 8:33 ` Eli Zaretskii
2015-10-17 11:57 ` Alan Mackenzie
2015-10-17 12:34 ` Eli Zaretskii
2015-10-17 13:31 ` Eli Zaretskii
2015-10-17 14:22 ` Eli Zaretskii
2015-10-18 15:00 ` Alan Mackenzie
2015-10-18 17:44 ` Eli Zaretskii
2015-10-19 10:27 ` Alan Mackenzie
2015-10-27 13:40 ` Alan Mackenzie
2015-10-27 17:35 ` Alan Mackenzie
2015-10-27 18:33 ` Eli Zaretskii
2015-10-27 18:23 ` Eli Zaretskii
2015-10-28 8:58 ` Alan Mackenzie
2015-10-28 13:15 ` Alan Mackenzie
2015-10-31 13:21 ` Eli Zaretskii
2015-10-31 21:17 ` Alan Mackenzie
2015-11-01 3:40 ` Eli Zaretskii
2015-11-01 14:45 ` Alan Mackenzie
2015-11-01 15:23 ` Alan Mackenzie
2015-11-01 17:45 ` Eli Zaretskii
2015-11-01 18:07 ` Eli Zaretskii
2015-11-01 18:46 ` Alan Mackenzie
2015-10-18 14:53 ` Alan Mackenzie
2015-10-18 17:46 ` Eli Zaretskii
2015-10-19 10:45 ` Alan Mackenzie
2015-10-19 10:56 ` Eli Zaretskii
2015-10-19 11:24 ` Alan Mackenzie
2015-10-19 11:28 ` Eli Zaretskii
2015-10-19 12:02 ` Alan Mackenzie
2015-10-19 12:33 ` Eli Zaretskii
2015-10-19 13:11 ` Alan Mackenzie
2015-10-19 13:27 ` Eli Zaretskii
2015-10-19 19:15 ` Alan Mackenzie
2015-10-27 13:46 ` Alan Mackenzie [this message]
2015-10-17 15:30 ` Alan Mackenzie
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