bug#59290: 29.0.50; [PATCH] Buffer-localize temporary-goal-column

bug#59290: 29.0.50; [PATCH] Buffer-localize temporary-goal-column

[dick]

[-- Attachment #1: Type: text/plain, Size: 351 bytes --]


emacs -Q -l cl-lib --eval " \
(with-temp-buffer \
  (save-excursion \
    (insert \"עִבְרִית\nעִבְרִית\")) \
  (call-interactively (function next-line)) \
  (with-temp-buffer \
    (save-excursion (insert \"English\nEnglish\")) \
    (call-interactively (function next-line)) \
    (cl-assert (zerop (current-column)))))"


[-- Attachment #2: 0001-Temporary-goal-column-leaks.patch --]
[-- Type: text/x-diff, Size: 1711 bytes --]

From 44ca27270bdd7786ddb36469149128b6d18aac9a Mon Sep 17 00:00:00 2001
From: dickmao <dick.r.chiang@gmail.com>
Date: Tue, 15 Nov 2022 16:03:48 -0500
Subject: [PATCH] Temporary goal column leaks

* lisp/simple.el (temporary-goal-column): Buffer-localize.
* test/lisp/simple-tests.el (line-move-visual-goal-column-leakage):
Test it.
---
 lisp/simple.el            |  2 +-
 test/lisp/simple-tests.el | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/lisp/simple.el b/lisp/simple.el
index 0f44b14948c..fa4a7f0638d 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -7463,7 +7463,7 @@ goal-column
   :group 'editing-basics)
 (make-variable-buffer-local 'goal-column)
 
-(defvar temporary-goal-column 0
+(defvar-local temporary-goal-column 0
   "Current goal column for vertical motion.
 It is the column where point was at the start of the current run
 of vertical motion commands.
diff --git a/test/lisp/simple-tests.el b/test/lisp/simple-tests.el
index d067f3e586e..e3ecec287d7 100644
--- a/test/lisp/simple-tests.el
+++ b/test/lisp/simple-tests.el
@@ -1045,5 +1045,15 @@ simple-tests-zap-to-char
     (with-zap-to-char-test "abcdeCXYZ" "XYZ"
       (zap-to-char 1 ?C 'interactive))))
 
+(ert-deftest line-move-visual-goal-column-leakage ()
+  (skip-unless (not noninteractive))
+  (with-temp-buffer
+    (save-excursion (insert "עִבְרִית\nעִבְרִית"))
+    (call-interactively #'next-line)
+    (with-temp-buffer
+      (save-excursion (insert "English\nEnglish"))
+      (call-interactively #'next-line)
+      (should (zerop (current-column))))))
+
 (provide 'simple-test)
 ;;; simple-tests.el ends here
-- 
2.36.1


[-- Attachment #3: Type: text/plain, Size: 12319 bytes --]




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bug#59290: 29.0.50; [PATCH] Buffer-localize temporary-goal-column

[Eli Zaretskii]

> From: dick <dick.r.chiang@gmail.com>
> Date: Tue, 15 Nov 2022 16:52:10 -0500
> 
> emacs -Q -l cl-lib --eval " \
> (with-temp-buffer \
>   (save-excursion \
>     (insert \"עִבְרִית\nעִבְרִית\")) \
>   (call-interactively (function next-line)) \
>   (with-temp-buffer \
>     (save-excursion (insert \"English\nEnglish\")) \
>     (call-interactively (function next-line)) \
>     (cl-assert (zerop (current-column)))))"
> 
> 
> >From 44ca27270bdd7786ddb36469149128b6d18aac9a Mon Sep 17 00:00:00 2001
> From: dickmao <dick.r.chiang@gmail.com>
> Date: Tue, 15 Nov 2022 16:03:48 -0500
> Subject: [PATCH] Temporary goal column leaks
> 
> * lisp/simple.el (temporary-goal-column): Buffer-localize.
> * test/lisp/simple-tests.el (line-move-visual-goal-column-leakage):
> Test it.

Thanks, but please provide a meaningful commit log message with an
explanation of the problem and the solution.  AFAIU, it isn't
self-evident.  For example, if I invoke the program interactively in a
running Emacs session, the problem doesn't happen.  Your test seems to
acknowledge that, as is evidenced by this:

> +(ert-deftest line-move-visual-goal-column-leakage ()
> +  (skip-unless (not noninteractive))  <<<<<<<<<<<<<<<<<<<<<<<

but without any explanation.

With the root cause of this stated explicitly, it might be that we
will want or at least consider a different solution.

bug#59290: 29.0.50; [PATCH] Buffer-localize temporary-goal-column

[Stefan Kangas]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: dick <dick.r.chiang@gmail.com>
>> Date: Tue, 15 Nov 2022 16:52:10 -0500
>>
>> emacs -Q -l cl-lib --eval " \
>> (with-temp-buffer \
>>   (save-excursion \
>>     (insert \"עִבְרִית\nעִבְרִית\")) \
>>   (call-interactively (function next-line)) \
>>   (with-temp-buffer \
>>     (save-excursion (insert \"English\nEnglish\")) \
>>     (call-interactively (function next-line)) \
>>     (cl-assert (zerop (current-column)))))"
>>
>>
>> >From 44ca27270bdd7786ddb36469149128b6d18aac9a Mon Sep 17 00:00:00 2001
>> From: dickmao <dick.r.chiang@gmail.com>
>> Date: Tue, 15 Nov 2022 16:03:48 -0500
>> Subject: [PATCH] Temporary goal column leaks
>>
>> * lisp/simple.el (temporary-goal-column): Buffer-localize.
>> * test/lisp/simple-tests.el (line-move-visual-goal-column-leakage):
>> Test it.
>
> Thanks, but please provide a meaningful commit log message with an
> explanation of the problem and the solution.  AFAIU, it isn't
> self-evident.  For example, if I invoke the program interactively in a
> running Emacs session, the problem doesn't happen.  Your test seems to
> acknowledge that, as is evidenced by this:
>
>> +(ert-deftest line-move-visual-goal-column-leakage ()
>> +  (skip-unless (not noninteractive))  <<<<<<<<<<<<<<<<<<<<<<<
>
> but without any explanation.
>
> With the root cause of this stated explicitly, it might be that we
> will want or at least consider a different solution.

dick, could you please provide the information Eli is asking for above?

Thanks in advance.

bug#59290: 29.0.50; [PATCH] Buffer-localize temporary-goal-column

[Eli Zaretskii]

> From: dick <dick.r.chiang@gmail.com>
> Cc: Eli Zaretskii <eliz@gnu.org>,  59290@debbugs.gnu.org
> Date: Sun, 03 Sep 2023 08:04:56 -0400
> 
> >>> +  (skip-unless (not noninteractive))  <<<<<<<<<<<<<<<<<<<<<<<
> 
> Whoever came up with skip-unless and noninteractive sought max obfuscation.
> 
> EZ is confused because the quadruple negative distills to "proceed if
> interactive", the opposite of his conclusion.

I might be confused about the condition, but you seem to be confused
about the results: when I evaluate this program, the final column is
zero (zerop returns t), so I see no problem.  Assuming you wanted to
demonstrate a problem in Emacs rather than in my code-reading
abilities, the ball is still in your court.

bug#59290: 29.0.50; [PATCH] Buffer-localize temporary-goal-column

[Eli Zaretskii]

> From: dick <dick.r.chiang@gmail.com>
> Cc: stefankangas@gmail.com,  59290@debbugs.gnu.org
> Date: Sun, 03 Sep 2023 08:57:50 -0400
> 
> I try to make triage easier by dispensing with the hand-waving and the
> human interest story, and providing one-liners that can be copy-pasted
> to a mostly compliant posix shell.
> 
> Here again is my original report, with one statement changed to make it
> more obvious:
> 
>     src/emacs -Q -l cl-lib --eval " \
>     (with-temp-buffer \
>       (save-excursion \
>         (insert \"עִבְרִית\nעִבְרִית\")) \
>       (call-interactively (function next-line)) \
>       (with-temp-buffer \
>         (save-excursion (insert \"English\nEnglish\")) \
>         (call-interactively (function next-line)) \
>         (unless (zerop (current-column)) \
>           (display-warning 'ez \"Hey idiot, didn't work\" :error))))"

What can I say? it does work here as expected in an interactive Emacs
session.

bug#59290: 29.0.50; [PATCH] Buffer-localize temporary-goal-column

[Stefan Kangas]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: dick <dick.r.chiang@gmail.com>
>> Cc: stefankangas@gmail.com,  59290@debbugs.gnu.org
>> Date: Sun, 03 Sep 2023 08:57:50 -0400
>>
>> I try to make triage easier by dispensing with the hand-waving and the
>> human interest story, and providing one-liners that can be copy-pasted
>> to a mostly compliant posix shell.
>>
>> Here again is my original report, with one statement changed to make it
>> more obvious:
>>
>>     src/emacs -Q -l cl-lib --eval " \
>>     (with-temp-buffer \
>>       (save-excursion \
>>         (insert \"עִבְרִית\nעִבְרִית\")) \
>>       (call-interactively (function next-line)) \
>>       (with-temp-buffer \
>>         (save-excursion (insert \"English\nEnglish\")) \
>>         (call-interactively (function next-line)) \
>>         (unless (zerop (current-column)) \
>>           (display-warning 'ez \"Hey idiot, didn't work\" :error))))"
>
> What can I say? it does work here as expected in an interactive Emacs
> session.

Closing.