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Subject: bug#10899: 24.0.93; c-forward-conditional should not move the mark
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Content preview: Recipe from "emacs -Q": 1. Visit the attached file. 2.
Type:
C-SPC C-c C-n C-c C-n --> Expected result: the region covers the two
"#ifdef"
preprocessor conditionals. --> Observed result: it covers only the
second one,
because the mark has moved when I typed the second "C-c C-n". [...]
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Content preview: Recipe from "emacs -Q": 1. Visit the attached file. 2. Type:
C-SPC C-c C-n C-c C-n --> Expected result: the region covers the two "#ifdef"
preprocessor conditionals. --> Observed result: it covers only the second
one, because the mark has moved when I typed the second "C-c C-n". [...]
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--e89a8ff2535072355c04b9f6cde2
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Recipe from "emacs -Q":
1. Visit the attached file.
2. Type: C-SPC C-c C-n C-c C-n
--> Expected result: the region covers the two "#ifdef" preprocessor
conditionals.
--> Observed result: it covers only the second one, because the mark
has moved when I typed the second "C-c C-n".
In GNU Emacs 24.0.93.1 (i386-mingw-nt6.1.7601)
of 2012-02-14 on DANI-PC
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
`configure --with-gcc (4.6)'
--
Dani Moncayo
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Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.428 (Entity 5.428) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Dani Moncayo <dmoncayo@HIDDEN> Subject: bug#10899: Acknowledgement (24.0.93; c-forward-conditional should not move the mark) Message-ID: <handler.10899.B.133036974922502.ack <at> debbugs.gnu.org> References: <CAH8Pv0hLmrfnHR-8J9ACV+SDAED6GL_tzJJ+D1FOHTpitWh0ZQ@HIDDEN> X-Gnu-PR-Message: ack 10899 X-Gnu-PR-Package: emacs Reply-To: 10899 <at> debbugs.gnu.org Date: Mon, 27 Feb 2012 19:10:04 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-gnu-emacs@HIDDEN If you wish to submit further information on this problem, please send it to 10899 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 10899: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D10899 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: bug#10899: 24.0.93; c-forward-conditional should not move the mark
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> Recipe from "emacs -Q":
> 1. Visit the attached file.
> 2. Type: C-SPC C-c C-n C-c C-n
>
> --> Expected result: the region covers the two "#ifdef" preprocessor
> conditionals.
> --> Observed result: it covers only the second one, because the mark
> has moved when I typed the second "C-c C-n".
I didn't read the docstring of the function, which says:
Move forward across a preprocessor conditional, leaving mark behind.
A prefix argument acts as a repeat count. With a negative argument,
move backward across a preprocessor conditional.
What does "leaving mark behind" mean exactly here? It seem to mean
"setting the mark at point, and then moving the point". At least it
is the behavior I observe.
But this behavior is undesirable (IMO - this is a movement command.
whats the point of setting the mark here?), and inconsistent with
analogous movement commands such as `forward-list'.
--
Dani Moncayo
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Subject: bug#10899: 24.0.93; c-forward-conditional should not move the mark
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> Date: Mon, 27 Feb 2012 20:29:55 +0100
> From: Dani Moncayo <dmoncayo@HIDDEN>
>
> What does "leaving mark behind" mean exactly here? It seem to mean
> "setting the mark at point, and then moving the point". At least it
> is the behavior I observe.
What else could it possibly mean?
> But this behavior is undesirable (IMO - this is a movement command.
> whats the point of setting the mark here?)
A conditional could, and frequently does, enclose a large portion of
the code. Leaving the mark where you were lets you get back there
with "C-x C-x", obviously, which is a convenience. In general, Emacs
commands that could potentially move a long way leave the mark behind.
> and inconsistent with analogous movement commands such as
> `forward-list'.
There's no need for consistency in all movement commands. In
particular, those that generally move short distances need not behave
the same as the other kind.
And you have "C-u C-c C-n" to do what you want.
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Subject: bug#10899: 24.0.93; c-forward-conditional should not move the mark
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>> What does "leaving mark behind" mean exactly here? =A0It seem to mean
>> "setting the mark at point, and then moving the point". =A0At least it
>> is the behavior I observe.
>
> What else could it possibly mean?
I don't know, but "to leave X behind" does not imply to move "X" from
its original position. So this wording seems confusing to me.
>> But this behavior is undesirable (IMO - this is a movement command.
>> whats the point of setting the mark here?)
>
> A conditional could, and frequently does, enclose a large portion of
> the code. =A0Leaving the mark where you were lets you get back there
> with "C-x C-x", obviously, which is a convenience. =A0In general, Emacs
> commands that could potentially move a long way leave the mark behind.
>
>> and inconsistent with analogous movement commands such as
>> `forward-list'.
>
> There's no need for consistency in all movement commands. =A0In
> particular, those that generally move short distances need not behave
> the same as the other kind.
>
Consistency is a good design principle to follow, unless there is good
reason not to. And frankly, I don't see a good reason here.
> And you have "C-u C-c C-n" to do what you want.
And if "C-c C-n" didn't set the mark, you would have "C-SPC C-c C-n"
to do what you want.
--=20
Dani Moncayo
X-Loop: help-debbugs@HIDDEN
Subject: bug#10899: 24.0.93; c-forward-conditional should not move the mark
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> Consistency is a good design principle to follow, unless there is good
> reason not to. =A0And frankly, I don't see a good reason here.
...and I'll explain why:
Well-known movement commands like `M-<', `M->' or the search commands
set the mark (IMO) because they meet two criteria:
1. They may move point to a distant location.
2. There is not an "inverse" command to move point back to the
original position (or near it): commands like `forward-list' or
`forward-page' meet criterion #1, but they don't set the mark because
you have `backward-list' and `backward-page' to move to the original
position.
And when command meet these two criteria, it should set the mark, but
only if it is inactive, because when the mark is active, the user
surely wants to extend the _current_ region, i.e., "leave the mark
alone where I've set it, and just move the point".
IMO, this is the behavior users expect, and are used to.
Summarizing:
a. `c-forward-conditional' and `c-backward-conditional' should not set
the mark, because each one has an inverse movement command.
b. Even if you disagree, those commands should not set the mark when
it is active.
--=20
Dani Moncayo
X-Loop: help-debbugs@HIDDEN
Subject: bug#10899: 24.0.93; c-forward-conditional should not move the mark
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> Summarizing:
> a. `c-forward-conditional' and `c-backward-conditional' should not set
> the mark, because each one has an inverse movement command.
> b. Even if you disagree, those commands should not set the mark when
> it is active.
All similar movement commands like `c-beginning-of-defun' and `c-end-of-defun'
take precautions against the behavior you found. They do this by using
the following condition before leaving mark behind:
(and transient-mark-mode mark-active)
The patch below fixes the remaining movement commands to do the same,
except `c-mark-function' that needs to be rewritten to follow the logic
of `mark-defun' for setting the mark.
=== modified file 'lisp/progmodes/cc-cmds.el'
--- lisp/progmodes/cc-cmds.el 2012-01-25 17:54:01 +0000
+++ lisp/progmodes/cc-cmds.el 2012-02-28 10:27:49 +0000
@@ -2910,7 +2910,8 @@ (defun c-up-conditional (count)
forward."
(interactive "p")
(let ((new-point (c-scan-conditionals (- count) -1)))
- (push-mark)
+ (or (and transient-mark-mode mark-active)
+ (push-mark))
(goto-char new-point))
(c-keep-region-active))
@@ -2920,7 +2921,8 @@ (defun c-up-conditional-with-else (count
directives."
(interactive "p")
(let ((new-point (c-scan-conditionals (- count) -1 t)))
- (push-mark)
+ (or (and transient-mark-mode mark-active)
+ (push-mark))
(goto-char new-point))
(c-keep-region-active))
@@ -2934,7 +2936,8 @@ (defun c-down-conditional (count)
backward."
(interactive "p")
(let ((new-point (c-scan-conditionals count 1)))
- (push-mark)
+ (or (and transient-mark-mode mark-active)
+ (push-mark))
(goto-char new-point))
(c-keep-region-active))
@@ -2944,7 +2947,8 @@ (defun c-down-conditional-with-else (cou
directives."
(interactive "p")
(let ((new-point (c-scan-conditionals count 1 t)))
- (push-mark)
+ (or (and transient-mark-mode mark-active)
+ (push-mark))
(goto-char new-point))
(c-keep-region-active))
@@ -2959,7 +2963,8 @@ (defun c-backward-conditional (count &op
to call `c-scan-conditionals' directly instead."
(interactive "p")
(let ((new-point (c-scan-conditionals (- count) target-depth with-else)))
- (push-mark)
+ (or (and transient-mark-mode mark-active)
+ (push-mark))
(goto-char new-point))
(c-keep-region-active))
@@ -2980,7 +2985,8 @@ (defun c-forward-conditional (count &opt
to call `c-scan-conditionals' directly instead."
(interactive "p")
(let ((new-point (c-scan-conditionals count target-depth with-else)))
- (push-mark)
+ (or (and transient-mark-mode mark-active)
+ (push-mark))
(goto-char new-point)))
(defun c-scan-conditionals (count &optional target-depth with-else)
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>> Summarizing:
>> a. `c-forward-conditional' and `c-backward-conditional' should not set
>> the mark, because each one has an inverse movement command.
>> b. Even if you disagree, those commands should not set the mark when
>> it is active.
>
> All similar movement commands like `c-beginning-of-defun' and `c-end-of-d=
efun'
> take precautions against the behavior you found. =A0They do this by using
> the following condition before leaving mark behind:
>
> =A0(and transient-mark-mode mark-active)
>
> The patch below fixes the remaining movement commands to do the same,
> except `c-mark-function' that needs to be rewritten to follow the logic
> of `mark-defun' for setting the mark.
Thanks Juri, for working on this and many other fixes/improvements to Emacs=
.
Regarding your patch, I think it clearly improve the current behavior,
but I want to emphasize again that, IMO, setting the mark in too many
commands is bad, because it overfills the mark ring, thus making
harder to return to earlier positions.
--=20
Dani Moncayo
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Subject: bug#10899: 24.0.93; c-forward-conditional should not move the mark
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(Dani Moncayo's message of "Tue, 28 Feb 2012 08:42:43 +0100")
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> Summarizing:
> a. `c-forward-conditional' and `c-backward-conditional' should not set
> the mark, because each one has an inverse movement command.
> b. Even if you disagree, those commands should not set the mark when
> it is active.
FWIW I completely agree.
Stefan
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Subject: bug#10899: 24.0.93; c-forward-conditional should not move the mark
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> Regarding your patch, I think it clearly improve the current behavior,
> but I want to emphasize again that, IMO, setting the mark in too many
> commands is bad, because it overfills the mark ring, thus making
> harder to return to earlier positions.
What I wanted to achieve is to make C movement commands to behave exactly
as their Lisp counterparts. I see the following correspondence:
leaves mark behind?
c-beginning-of-defun beginning-of-defun yes
c-end-of-defun end-of-defun yes
c-mark-function mark-defun yes
c-up-conditional backward-up-list no
c-down-conditional down-list no
c-backward-conditional backward-list no
c-forward-conditional forward-list no
So I agree that `c-forward-conditional' and `c-backward-conditional'
should not push the mark.
Regarding bug#10906, I think `c-mark-function' should be rewritten
to follow the logic of `mark-defun'.
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