* bug#18712: 24.3; IELM fails to move point in a working buffer that is also displayed
@ 2014-10-13 22:16 Trevor Murphy
2014-10-14 15:41 ` Glenn Morris
2014-10-14 18:53 ` Stefan Monnier
0 siblings, 2 replies; 6+ messages in thread
From: Trevor Murphy @ 2014-10-13 22:16 UTC (permalink / raw)
To: 18712
Hi, list. I just noticed the following. If I start from `emacs
-Q', then go:
1. M-x ielm RET
2. C-c C-b *scratch* RET
3. Type `(goto-char 1)' at the ELISP prompt and hit RET
4. C-x 4 C-o *scratch* RET
Then I see the *scratch* buffer in the other window with its point
on the first character in the buffer (the first `;' on the first
line).
However, if I reverse the order of steps (3) and (4) above, again
starting from `emacs -Q':
1. M-x ielm RET
2. C-c C-b *scratch* RET
3. C-x 4 C-o *scratch* RET
4. Type `(goto-char 1)' at the ELISP prompt and hit RET
Then I see the *scratch* buffer in the other window with its point
unmoved (still at the start of the second line after the initial
scratch message).
Is this a bug? And, if so, is it reproducible given the info
below?
Thanks in advance.
In GNU Emacs 24.3.1 (i686-pc-linux-gnu, GTK+ Version 3.12.2)
of 2014-06-11 on var-lib-archbuild-staging-i686-jgc
Windowing system distributor `The X.Org Foundation', version
11.0.11601000
System Description: Arch Linux
Configured using:
`configure '--prefix=/usr' '--sysconfdir=/etc'
'--libexecdir=/usr/lib'
'--localstatedir=/var' '--with-x-toolkit=gtk3' '--with-xft'
'CFLAGS=-march=i686 -mtune=generic -O2 -pipe
-fstack-protector-strong
--param=ssp-buffer-size=4'
'LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro'
'CPPFLAGS=-D_FORTIFY_SOURCE=2''
Important settings:
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix
default enable-multibyte-characters: t
--
Trevor Murphy
GnuPG Key: 0x83881C0A
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#18712: 24.3; IELM fails to move point in a working buffer that is also displayed
2014-10-13 22:16 bug#18712: 24.3; IELM fails to move point in a working buffer that is also displayed Trevor Murphy
@ 2014-10-14 15:41 ` Glenn Morris
2014-10-14 18:53 ` Stefan Monnier
1 sibling, 0 replies; 6+ messages in thread
From: Glenn Morris @ 2014-10-14 15:41 UTC (permalink / raw)
To: Trevor Murphy; +Cc: 18712
Trevor Murphy wrote:
> 1. M-x ielm RET
> 2. C-c C-b *scratch* RET
> 3. Type `(goto-char 1)' at the ELISP prompt and hit RET
> 4. C-x 4 C-o *scratch* RET
>
> Then I see the *scratch* buffer in the other window with its point on
> the first character in the buffer (the first `;' on the first line).
>
> However, if I reverse the order of steps (3) and (4) above, again
> starting from `emacs -Q':
> 1. M-x ielm RET
> 2. C-c C-b *scratch* RET
> 3. C-x 4 C-o *scratch* RET
> 4. Type `(goto-char 1)' at the ELISP prompt and hit RET
>
> Then I see the *scratch* buffer in the other window with its point
> unmoved (still at the start of the second line after the initial
> scratch message).
I think this is not a bug; you are seeing the difference between "window
point" and "point". See section "Windows and Point" in the elisp manual.
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#18712: 24.3; IELM fails to move point in a working buffer that is also displayed
2014-10-13 22:16 bug#18712: 24.3; IELM fails to move point in a working buffer that is also displayed Trevor Murphy
2014-10-14 15:41 ` Glenn Morris
@ 2014-10-14 18:53 ` Stefan Monnier
2014-10-14 19:57 ` Josh
1 sibling, 1 reply; 6+ messages in thread
From: Stefan Monnier @ 2014-10-14 18:53 UTC (permalink / raw)
To: Trevor Murphy; +Cc: 18712
> Is this a bug?
No, but it's a common trap. Every buffer has as many "points" as it has
windows displaying it (plus one for the buffer itself).
So if you want to move point in a specific window, you need to either
select the window before moving, or use `set-window-point'.
Stefan
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#18712: 24.3; IELM fails to move point in a working buffer that is also displayed
2014-10-14 18:53 ` Stefan Monnier
@ 2014-10-14 19:57 ` Josh
2014-10-14 23:49 ` Stefan Monnier
0 siblings, 1 reply; 6+ messages in thread
From: Josh @ 2014-10-14 19:57 UTC (permalink / raw)
To: Stefan Monnier; +Cc: Trevor Murphy, 18712
[-- Attachment #1: Type: text/plain, Size: 500 bytes --]
On Tue, Oct 14, 2014 at 11:53 AM, Stefan Monnier <monnier@iro.umontreal.ca>
wrote:
> > Is this a bug?
>
> No, but it's a common trap. Every buffer has as many "points" as it has
> windows displaying it (plus one for the buffer itself).
> So if you want to move point in a specific window, you need to either
> select the window before moving, or use `set-window-point'.
>
What would be involved in implementing something like a
`ielm-change-working-window-buffer' that behaved as the OP
expected?
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^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#18712: 24.3; IELM fails to move point in a working buffer that is also displayed
2014-10-14 19:57 ` Josh
@ 2014-10-14 23:49 ` Stefan Monnier
2014-10-17 19:05 ` Trevor Murphy
0 siblings, 1 reply; 6+ messages in thread
From: Stefan Monnier @ 2014-10-14 23:49 UTC (permalink / raw)
To: Josh; +Cc: Trevor Murphy, 18712
> What would be involved in implementing something like a
> `ielm-change-working-window-buffer' that behaved as the OP
> expected?
The same kind of code as used in ielm-change-working-buffer.
Stefan
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#18712: 24.3; IELM fails to move point in a working buffer that is also displayed
2014-10-14 23:49 ` Stefan Monnier
@ 2014-10-17 19:05 ` Trevor Murphy
0 siblings, 0 replies; 6+ messages in thread
From: Trevor Murphy @ 2014-10-17 19:05 UTC (permalink / raw)
To: Glenn Morris, Stefan Monnier, Josh; +Cc: 18712
Glenn Morris <rgm@gnu.org> writes:
> I think this is not a bug; you are seeing the difference between
> "window point" and "point". See section "Windows and Point" in
> the elisp manual.
Thank you for the manual reference, Glenn.
Stefan Monnier <monnier@IRO.UMontreal.CA> writes:
>
> No, but it's a common trap. Every buffer has as many "points"
> as it has windows displaying it (plus one for the buffer
> itself). So if you want to move point in a specific window, you
> need to either select the window before moving, or use
> `set-window-point'.
Window points! That makes so much sense now.
Rather than rewrite the `ielm-change-working-buffer' code, I've
just after-advised `ielm-send-input' to set the window point in
the working buffer.
Thanks, all!
--
Trevor Murphy
GnuPG Key: 0x83881C0A
^ permalink raw reply [flat|nested] 6+ messages in thread
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2014-10-13 22:16 bug#18712: 24.3; IELM fails to move point in a working buffer that is also displayed Trevor Murphy
2014-10-14 15:41 ` Glenn Morris
2014-10-14 18:53 ` Stefan Monnier
2014-10-14 19:57 ` Josh
2014-10-14 23:49 ` Stefan Monnier
2014-10-17 19:05 ` Trevor Murphy
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