GNU bug report logs - #70795
30.0.50; inconsistent warning-display-at-bottom display-buffer-alist behavior

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Package: emacs; Reported by: Gerard Vermeulen <gerard.vermeulen@HIDDEN>; merged with #70773; Done: Juri Linkov <juri@HIDDEN>; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
bug marked as fixed in version 30.0.50, send any further explanations to 70795 <at> debbugs.gnu.org and Gerard Vermeulen <gerard.vermeulen@HIDDEN> Request was from Juri Linkov <juri@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Forcibly Merged 70773 70795. Request was from Juri Linkov <juri@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Juri Linkov <juri@HIDDEN>
To: Gerard Vermeulen <gerard.vermeulen@HIDDEN>
Subject: Re: bug#70795: 30.0.50; inconsistent warning-display-at-bottom
 display-buffer-alist behavior
In-Reply-To: <868r0na0sa.fsf@HIDDEN> (Juri Linkov's message of "Mon, 
 06 May 2024 09:46:57 +0300")
Organization: LINKOV.NET
References: <0dec4b001f2bc7521541e4262a623c41@HIDDEN>
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forcemerge 70773 70795
close 70795 30.0.50
thanks

>> (add-to-list 'display-buffer-alist
>>                `(,(rx (or "*Warnings*" "*compilation*"))
>>                  display-buffer-no-window
>>                  (allow-no-window . t)))
>>
>> then warnings are added to the hidden *Warnings* buffer.
>
> This is because this case doesn't set 'warning-series',
> so when window is nil, it doesn't fail at anoter place
> while calling 'set-window-start':
>
>   (when (and (markerp warning-series)
>              (eq (marker-buffer warning-series) buffer))
>     (set-window-start window warning-series))
>
> Ok, I will add only checks for nil window.
> But won't add (allow-no-window . t) to the caller of
> 'display-buffer' in 'display-warning' to not encourage
> hiding the warning buffer.

So now pushed the extra guards for windows.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#70795; Package emacs. Full text available.

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From: Juri Linkov <juri@HIDDEN>
To: Gerard Vermeulen <gerard.vermeulen@HIDDEN>
Subject: Re: bug#70795: 30.0.50; inconsistent warning-display-at-bottom
 display-buffer-alist behavior
In-Reply-To: <0dec4b001f2bc7521541e4262a623c41@HIDDEN> (Gerard Vermeulen's
 message of "Mon, 06 May 2024 06:06:03 +0000")
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Date: Mon, 06 May 2024 09:46:57 +0300
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> (add-to-list 'display-buffer-alist
>                `(,(rx (or "*Warnings*" "*compilation*"))
>                  display-buffer-no-window
>                  (allow-no-window . t)))
>
> then warnings are added to the hidden *Warnings* buffer.

This is because this case doesn't set 'warning-series',
so when window is nil, it doesn't fail at anoter place
while calling 'set-window-start':

  (when (and (markerp warning-series)
             (eq (marker-buffer warning-series) buffer))
    (set-window-start window warning-series))

Ok, I will add only checks for nil window.
But won't add (allow-no-window . t) to the caller of
'display-buffer' in 'display-warning' to not encourage
hiding the warning buffer.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#70795; Package emacs. Full text available.

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Date: Mon, 06 May 2024 06:06:03 +0000
From: Gerard Vermeulen <gerard.vermeulen@HIDDEN>
To: Bug gnu emacs <bug-gnu-emacs@HIDDEN>
Subject: 30.0.50; inconsistent warning-display-at-bottom
 display-buffer-alist behavior
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Hi,

if I set warning-display-at-bottom to nil and do

(add-to-list 'display-buffer-alist
                `(,(rx (or "*Warnings*" "*compilation*"))
                  display-buffer-no-window
                  (allow-no-window . t)))

then warnings are added to the hidden *Warnings* buffer.

But if I set warning-display-at-bottom to t, then I get an
window-live-p related error with the display-buffer-alist
setting above.

This bug is related to #70773 where Prot reports a similar
problem in a somewhat different context.
Juri Linkov proposed a patch which he retracted, but maybe
his patch solves the inconsistency reported here.

Regards -- Gerard
Acknowledgement sent to Gerard Vermeulen <gerard.vermeulen@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#70795; Package emacs. Full text available.
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