GNU bug report logs - #78957
31.0.50; Wrong mode-line in fancy diary

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Manuel Giraud <manuel <at> ledu-giraud.fr>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50; Wrong mode-line in fancy diary
Date: Fri, 04 Jul 2025 21:14:52 +0200

Hi,

When viewing diary entry from the calendar, the mode line could be set
erroneously.  The recipe:

          - Have a file "/tmp/diary" with the following content:
--8<---------------cut here---------------start------------->8---
July 4, 2025 A bitter day for many
--8<---------------cut here---------------end--------------->8---
          - emacs -Q
          - M-: (setopt diary-file "/tmp/diary") <RET>
          - M-: (toggle-frame-fullscreen) <RET>
          - M-: (calendar) <RET>
          - g d
          - 2025 <RET>
          - July <RET>
          - 4 <RET>
          - d

Observe that the date in the mode line of the diary view buffer is not
centered and maybe partly out of sight.  This seems to come from the
fact that the call to `window-edges' in `calendar-set-mode-line' does
not return correct values but I can't figure out why.


In GNU Emacs 31.0.50 (build 14, x86_64-unknown-openbsd7.7) of 2025-07-04
 built on computer
Repository revision: 763c3cd081a833940961373a73705640b1808636
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Windowing system distributor 'The X.Org Foundation', version 11.0.12101018
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-- 
Manuel Giraud

Message #8 received at 78957 <at> debbugs.gnu.org (full text, mbox):

From: Stephen Berman <stephen.berman <at> gmx.net>
To: Manuel Giraud <manuel <at> ledu-giraud.fr>
Cc: 78957 <at> debbugs.gnu.org
Subject: Re: bug#78957: 31.0.50; Wrong mode-line in fancy diary
Date: Sat, 05 Jul 2025 00:20:32 +0200

[Message part 1 (text/plain, inline)]

On Fri, 04 Jul 2025 21:14:52 +0200 Manuel Giraud <manuel <at> ledu-giraud.fr> wrote:

> Hi,
>
> When viewing diary entry from the calendar, the mode line could be set
> erroneously.  The recipe:
>
>           - Have a file "/tmp/diary" with the following content:
>
> July 4, 2025 A bitter day for many
>
>           - emacs -Q
>           - M-: (setopt diary-file "/tmp/diary") <RET>
>           - M-: (toggle-frame-fullscreen) <RET>
>           - M-: (calendar) <RET>
>           - g d
>           - 2025 <RET>
>           - July <RET>
>           - 4 <RET>
>           - d
>
> Observe that the date in the mode line of the diary view buffer is not
> centered and maybe partly out of sight.  This seems to come from the
> fact that the call to `window-edges' in `calendar-set-mode-line' does
> not return correct values but I can't figure out why.

I think it's because both times `window-edges' is called in
`diary-fancy-display' the selected window is the one displaying the
Calendar, whose `window-width' is the full screen width due to
`toggle-frame-fullscreen', while the window displaying the Fancy Diary
is half as wide.  The following patch seems to fix the problem for me:

[Message part 2 (text/x-patch, inline)]

diff --git a/lisp/calendar/diary-lib.el b/lisp/calendar/diary-lib.el
index 8fb6fadfe4c..3b0275d4cee 100644
--- a/lisp/calendar/diary-lib.el
+++ b/lisp/calendar/diary-lib.el
@@ -1058,7 +1058,8 @@ diary-fancy-display
   (unless (car (diary-display-no-entries)) ; no entries
     ;; Prepare the fancy diary buffer.
     (calendar-in-read-only-buffer diary-fancy-buffer
-      (calendar-set-mode-line "Diary Entries")
+      (with-selected-window (get-buffer-window diary-fancy-buffer)
+        (calendar-set-mode-line "Diary Entries"))
       (let ((holiday-list-last-month 1)
             (holiday-list-last-year 1)
             (date (list 0 0 0))
@@ -1139,7 +1140,8 @@ diary-fancy-display
       (if (eq major-mode 'diary-fancy-display-mode)
           (run-hooks 'diary-fancy-display-mode-hook)
         (diary-fancy-display-mode))
-      (calendar-set-mode-line diary--date-string))))
+      (with-selected-window (get-buffer-window diary-fancy-buffer)
+        (calendar-set-mode-line diary--date-string)))))
 
 ;; FIXME modernize?
 (defun diary-print-entries ()

[Message part 3 (text/plain, inline)]

Steve Berman

Message #11 received at 78957 <at> debbugs.gnu.org (full text, mbox):

From: Manuel Giraud <manuel <at> ledu-giraud.fr>
To: Stephen Berman <stephen.berman <at> gmx.net>
Cc: 78957 <at> debbugs.gnu.org
Subject: Re: bug#78957: 31.0.50; Wrong mode-line in fancy diary
Date: Sat, 05 Jul 2025 10:53:11 +0200

Stephen Berman <stephen.berman <at> gmx.net> writes:

> On Fri, 04 Jul 2025 21:14:52 +0200 Manuel Giraud <manuel <at> ledu-giraud.fr> wrote:
>
>> Hi,
>>
>> When viewing diary entry from the calendar, the mode line could be set
>> erroneously.  The recipe:
>>
>>           - Have a file "/tmp/diary" with the following content:
>>
>> July 4, 2025 A bitter day for many
>>
>>           - emacs -Q
>>           - M-: (setopt diary-file "/tmp/diary") <RET>
>>           - M-: (toggle-frame-fullscreen) <RET>
>>           - M-: (calendar) <RET>
>>           - g d
>>           - 2025 <RET>
>>           - July <RET>
>>           - 4 <RET>
>>           - d
>>
>> Observe that the date in the mode line of the diary view buffer is not
>> centered and maybe partly out of sight.  This seems to come from the
>> fact that the call to `window-edges' in `calendar-set-mode-line' does
>> not return correct values but I can't figure out why.
>
> I think it's because both times `window-edges' is called in
> `diary-fancy-display' the selected window is the one displaying the
> Calendar, whose `window-width' is the full screen width due to
> `toggle-frame-fullscreen', while the window displaying the Fancy Diary
> is half as wide.  The following patch seems to fix the problem for me:
>
> diff --git a/lisp/calendar/diary-lib.el b/lisp/calendar/diary-lib.el
> index 8fb6fadfe4c..3b0275d4cee 100644
> --- a/lisp/calendar/diary-lib.el
> +++ b/lisp/calendar/diary-lib.el
> @@ -1058,7 +1058,8 @@ diary-fancy-display
>    (unless (car (diary-display-no-entries)) ; no entries
>      ;; Prepare the fancy diary buffer.
>      (calendar-in-read-only-buffer diary-fancy-buffer
> -      (calendar-set-mode-line "Diary Entries")
> +      (with-selected-window (get-buffer-window diary-fancy-buffer)
> +        (calendar-set-mode-line "Diary Entries"))
>        (let ((holiday-list-last-month 1)
>              (holiday-list-last-year 1)
>              (date (list 0 0 0))
> @@ -1139,7 +1140,8 @@ diary-fancy-display
>        (if (eq major-mode 'diary-fancy-display-mode)
>            (run-hooks 'diary-fancy-display-mode-hook)
>          (diary-fancy-display-mode))
> -      (calendar-set-mode-line diary--date-string))))
> +      (with-selected-window (get-buffer-window diary-fancy-buffer)
> +        (calendar-set-mode-line diary--date-string)))))

Thanks!  That works as expected.  I thought that the set-buffer (from
calendar-in-read-only-buffer) was enough but apparently not.

While here, I will complete your patch for other calls of
calendar-set-mode-line (lunar phases,...)
-- 
Manuel Giraud

Message #14 received at 78957 <at> debbugs.gnu.org (full text, mbox):

From: Stephen Berman <stephen.berman <at> gmx.net>
To: Manuel Giraud <manuel <at> ledu-giraud.fr>
Cc: 78957 <at> debbugs.gnu.org
Subject: Re: bug#78957: 31.0.50; Wrong mode-line in fancy diary
Date: Sat, 05 Jul 2025 12:02:52 +0200

[Message part 1 (text/plain, inline)]

On Sat, 05 Jul 2025 10:53:11 +0200 Manuel Giraud <manuel <at> ledu-giraud.fr> wrote:

> Stephen Berman <stephen.berman <at> gmx.net> writes:
>
>> On Fri, 04 Jul 2025 21:14:52 +0200 Manuel Giraud <manuel <at> ledu-giraud.fr> wrote:
>>
>>> Hi,
>>>
>>> When viewing diary entry from the calendar, the mode line could be set
>>> erroneously.  The recipe:
>>>
>>>           - Have a file "/tmp/diary" with the following content:
>>>
>>> July 4, 2025 A bitter day for many
>>>
>>>           - emacs -Q
>>>           - M-: (setopt diary-file "/tmp/diary") <RET>
>>>           - M-: (toggle-frame-fullscreen) <RET>
>>>           - M-: (calendar) <RET>
>>>           - g d
>>>           - 2025 <RET>
>>>           - July <RET>
>>>           - 4 <RET>
>>>           - d
>>>
>>> Observe that the date in the mode line of the diary view buffer is not
>>> centered and maybe partly out of sight.  This seems to come from the
>>> fact that the call to `window-edges' in `calendar-set-mode-line' does
>>> not return correct values but I can't figure out why.
>>
>> I think it's because both times `window-edges' is called in
>> `diary-fancy-display' the selected window is the one displaying the
>> Calendar, whose `window-width' is the full screen width due to
>> `toggle-frame-fullscreen', while the window displaying the Fancy Diary
>> is half as wide.  The following patch seems to fix the problem for me:
>>
>> diff --git a/lisp/calendar/diary-lib.el b/lisp/calendar/diary-lib.el
>> index 8fb6fadfe4c..3b0275d4cee 100644
>> --- a/lisp/calendar/diary-lib.el
>> +++ b/lisp/calendar/diary-lib.el
>> @@ -1058,7 +1058,8 @@ diary-fancy-display
>>    (unless (car (diary-display-no-entries)) ; no entries
>>      ;; Prepare the fancy diary buffer.
>>      (calendar-in-read-only-buffer diary-fancy-buffer
>> -      (calendar-set-mode-line "Diary Entries")
>> +      (with-selected-window (get-buffer-window diary-fancy-buffer)
>> +        (calendar-set-mode-line "Diary Entries"))
>>        (let ((holiday-list-last-month 1)
>>              (holiday-list-last-year 1)
>>              (date (list 0 0 0))
>> @@ -1139,7 +1140,8 @@ diary-fancy-display
>>        (if (eq major-mode 'diary-fancy-display-mode)
>>            (run-hooks 'diary-fancy-display-mode-hook)
>>          (diary-fancy-display-mode))
>> -      (calendar-set-mode-line diary--date-string))))
>> +      (with-selected-window (get-buffer-window diary-fancy-buffer)
>> +        (calendar-set-mode-line diary--date-string)))))
>
> Thanks!  That works as expected.  I thought that the set-buffer (from
> calendar-in-read-only-buffer) was enough but apparently not.
>
> While here, I will complete your patch for other calls of
> calendar-set-mode-line (lunar phases,...)

I hope you haven't spent time on that yet, because it occurred to me
that the following patch might suffice:

[Message part 2 (text/x-patch, inline)]

diff --git a/lisp/calendar/calendar.el b/lisp/calendar/calendar.el
index 917624c489e..6b23cbcd1d4 100644
--- a/lisp/calendar/calendar.el
+++ b/lisp/calendar/calendar.el
@@ -1167,7 +1167,7 @@ calendar-in-read-only-buffer
      (setq buffer-read-only nil
            buffer-undo-list t)
      (erase-buffer)
-     (display-buffer ,buffer)
+     (select-window (display-buffer ,buffer))
      ,@body
      (goto-char (point-min))
      (set-buffer-modified-p nil)

[Message part 3 (text/plain, inline)]

It seems to DTRT for all users of `calendar-in-read-only-buffer' (after
byte-compiling), if I haven't overlooked anything.

Steve Berman

Message #17 received at 78957 <at> debbugs.gnu.org (full text, mbox):

From: Manuel Giraud <manuel <at> ledu-giraud.fr>
To: Stephen Berman <stephen.berman <at> gmx.net>
Cc: 78957 <at> debbugs.gnu.org
Subject: Re: bug#78957: 31.0.50; Wrong mode-line in fancy diary
Date: Sat, 05 Jul 2025 12:19:40 +0200

[Message part 1 (text/plain, inline)]

Stephen Berman <stephen.berman <at> gmx.net> writes:

[...]

> I hope you haven't spent time on that yet, because it occurred to me
> that the following patch might suffice:

:-D I did not spend to much time but, in the mean time, came up with
this one:

[0001-Fix-mode-line-string-width-in-diary-view.patch (text/x-patch, inline)]

From 5b1b04936e5d31197ea5129fb7e56e28f0aa24ad Mon Sep 17 00:00:00 2001
From: Stephen Berman <stephen.berman <at> gmx.net>
Date: Sat, 5 Jul 2025 10:56:00 +0200
Subject: [PATCH] Fix mode-line string width in diary view

* lisp/calendar/calendar.el (calendar-in-read-only-buffer):
Select the buffer window because, for example,
`calendar-set-mode-line' needs it.
---
 lisp/calendar/calendar.el | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lisp/calendar/calendar.el b/lisp/calendar/calendar.el
index 917624c489e..8b7aa71db93 100644
--- a/lisp/calendar/calendar.el
+++ b/lisp/calendar/calendar.el
@@ -1168,8 +1168,9 @@ calendar-in-read-only-buffer
            buffer-undo-list t)
      (erase-buffer)
      (display-buffer ,buffer)
-     ,@body
-     (goto-char (point-min))
+     (with-selected-window (get-buffer-window ,buffer)
+       ,@body
+       (goto-char (point-min)))
      (set-buffer-modified-p nil)
      (setq buffer-read-only t)))
 
-- 
2.49.0

[Message part 3 (text/plain, inline)]

But, I prefer yours.  Do you mind if I complete your patch with my log
entry?
-- 
Manuel Giraud

Message #20 received at 78957 <at> debbugs.gnu.org (full text, mbox):

From: Stephen Berman <stephen.berman <at> gmx.net>
To: Manuel Giraud <manuel <at> ledu-giraud.fr>
Cc: 78957 <at> debbugs.gnu.org
Subject: Re: bug#78957: 31.0.50; Wrong mode-line in fancy diary
Date: Sat, 05 Jul 2025 12:23:21 +0200

On Sat, 05 Jul 2025 12:19:40 +0200 Manuel Giraud <manuel <at> ledu-giraud.fr> wrote:

> Stephen Berman <stephen.berman <at> gmx.net> writes:
>
> [...]
>
>> I hope you haven't spent time on that yet, because it occurred to me
>> that the following patch might suffice:
>
> :-D I did not spend to much time but, in the mean time, came up with
> this one:
>
>>From 5b1b04936e5d31197ea5129fb7e56e28f0aa24ad Mon Sep 17 00:00:00 2001
> From: Stephen Berman <stephen.berman <at> gmx.net>
> Date: Sat, 5 Jul 2025 10:56:00 +0200
> Subject: [PATCH] Fix mode-line string width in diary view
>
> * lisp/calendar/calendar.el (calendar-in-read-only-buffer):
> Select the buffer window because, for example,
> `calendar-set-mode-line' needs it.
> ---
>  lisp/calendar/calendar.el | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/lisp/calendar/calendar.el b/lisp/calendar/calendar.el
> index 917624c489e..8b7aa71db93 100644
> --- a/lisp/calendar/calendar.el
> +++ b/lisp/calendar/calendar.el
> @@ -1168,8 +1168,9 @@ calendar-in-read-only-buffer
>             buffer-undo-list t)
>       (erase-buffer)
>       (display-buffer ,buffer)
> -     ,@body
> -     (goto-char (point-min))
> +     (with-selected-window (get-buffer-window ,buffer)
> +       ,@body
> +       (goto-char (point-min)))
>       (set-buffer-modified-p nil)
>       (setq buffer-read-only t)))
>  
> -- 
> 2.49.0
>
>
> But, I prefer yours.  Do you mind if I complete your patch with my log
> entry?

Be my guest :-)

Steve Berman

Message #23 received at 78957 <at> debbugs.gnu.org (full text, mbox):

From: Manuel Giraud <manuel <at> ledu-giraud.fr>
To: Stephen Berman <stephen.berman <at> gmx.net>
Cc: 78957 <at> debbugs.gnu.org
Subject: Re: bug#78957: 31.0.50; Wrong mode-line in fancy diary
Date: Sat, 05 Jul 2025 12:30:39 +0200

Stephen Berman <stephen.berman <at> gmx.net> writes:

[...]

>> But, I prefer yours.  Do you mind if I complete your patch with my log
>> entry?
>
> Be my guest :-)

Sorry I spoke to quick.  I think mine does the right thing, because it
preserve the selected window as the calendar (as it used to be).  WDYT?
-- 
Manuel Giraud

Message #26 received at 78957 <at> debbugs.gnu.org (full text, mbox):

From: Stephen Berman <stephen.berman <at> gmx.net>
To: Manuel Giraud <manuel <at> ledu-giraud.fr>
Cc: 78957 <at> debbugs.gnu.org
Subject: Re: bug#78957: 31.0.50; Wrong mode-line in fancy diary
Date: Sat, 05 Jul 2025 12:40:13 +0200

On Sat, 05 Jul 2025 12:30:39 +0200 Manuel Giraud <manuel <at> ledu-giraud.fr> wrote:

> Stephen Berman <stephen.berman <at> gmx.net> writes:
>
> [...]
>
>>> But, I prefer yours.  Do you mind if I complete your patch with my log
>>> entry?
>>
>> Be my guest :-)
>
> Sorry I spoke to quick.  I think mine does the right thing, because it
> preserve the selected window as the calendar (as it used to be).  WDYT?

Ah, right, I did overlook that.  Yes, your patch is better.

Steve Berman

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