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Re: C-n and fields
From: |
Chong Yidong |
Subject: |
Re: C-n and fields |
Date: |
Sat, 16 Sep 2006 10:59:09 -0400 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux) |
Richard Stallman <address@hidden> writes:
> It's now clear what the behavior of C-n with fields needs to be.
> It should keep the column number as close as possible to the desired one
> but without moving across field boundaries.
>
> Can someone please implement that, then ack?
The behavior was broken by my 2006-08-03 change to
line-move-to-column, which in retrospect is completely misguided.
I've now reverted it.
The change was originally aimed at a line-motion bug reported on
emacs-pretest-bug on 18 July ("C-n doesn't work in Customize Option
buffer in -nw with long value displayed"). The way to trigger this
bug was supplied by Johan BockgÃrd:
(insert (propertize "x" 'field t)
(make-string 89 ?y)
"\n")
Put point on the x (or the first y) and press C-n. Point doesn't
move.
I now think the problem lies, not in line-move-to-column, but in
line-end-position. After computing the line end position,
line-end-position calls constrain-to-field with a nil ESCAPE-FROM-EDGE
argument. Thus, if point lies right at the edge of the field,
X|YYYYY
non-nil ^ null
`field' point `field'
property property
Then line-end-position reports the field end position, and similarly
end-of-line won't move point. This is counter-intuitive.
How bout making line-end-position pass a non-nil ESCAPE-FROM-EDGE
argument? (This indeed fixes the bug in the test case.)
*** emacs/src/editfns.c.~1.428.~ 2006-09-12 23:04:03.000000000 -0400
--- emacs/src/editfns.c 2006-09-16 10:42:43.000000000 -0400
***************
*** 874,880 ****
/* Return END_POS constrained to the current input field. */
return Fconstrain_to_field (make_number (end_pos), make_number (orig),
! Qnil, Qt, Qnil);
}
--- 874,880 ----
/* Return END_POS constrained to the current input field. */
return Fconstrain_to_field (make_number (end_pos), make_number (orig),
! Qt, Qt, Qnil);
}
- C-n and fields, Richard Stallman, 2006/09/08
- Re: C-n and fields,
Chong Yidong <=