GNU bug report logs - #53662
29.0.50; Cannot use tab-new from side window

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

From: Aaron Jensen <aaronjensen <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; Cannot use tab-new from side window
Date: Mon, 31 Jan 2022 10:25:10 -0500

If you attempt to tab-bar-new-tab while in a side window you get:

split-window: Cannot split side window or parent of side window

It also deletes other windows and leaves you in a very awkward
side-window-only state.

To repro:

emacs -Q
M-x tab-bar-mode
M-: (display-buffer-in-side-window (get-buffer "*Messages*") '((side . bottom)))
C-x o
M-x tab-new




In GNU Emacs 29.0.50 (build 1, aarch64-apple-darwin21.2.0, NS appkit-2113.20 Version 12.1 (Build 21C52))
 of 2022-01-04 built on aaron-m1.local
Windowing system distributor 'Apple', version 10.3.2113
System Description:  macOS 12.1

Configured using:
 'configure --disable-dependency-tracking --disable-silent-rules
 --enable-locallisppath=/opt/homebrew/share/emacs/site-lisp
 --infodir=/opt/homebrew/Cellar/emacs-plus <at> 29/29.0.50/share/info/emacs
 --prefix=/opt/homebrew/Cellar/emacs-plus <at> 29/29.0.50 --with-xml2
 --with-gnutls --with-native-compilation --without-dbus
 --without-imagemagick --with-modules --with-rsvg --with-ns
 --disable-ns-self-contained 'CFLAGS=-I/opt/homebrew/opt/gcc/include
 -I/opt/homebrew/opt/libgccjit/include -I/opt/homebrew/opt/gmp/include
 -I/opt/homebrew/opt/jpeg/include' 'LDFLAGS=-L/opt/homebrew/lib/gcc/11
 -I/opt/homebrew/opt/gcc/include -I/opt/homebrew/opt/libgccjit/include
 -I/opt/homebrew/opt/gmp/include -I/opt/homebrew/opt/jpeg/include''

Configured features:
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Message #8 received at 53662 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: martin rudalics <rudalics <at> gmx.at>
Cc: 53662 <at> debbugs.gnu.org, Aaron Jensen <aaronjensen <at> gmail.com>
Subject: Re: bug#53662: 29.0.50; Cannot use tab-new from side window
Date: Mon, 31 Jan 2022 20:15:29 +0200

> If you attempt to tab-bar-new-tab while in a side window you get:
>
> split-window: Cannot split side window or parent of side window
>
> It also deletes other windows and leaves you in a very awkward
> side-window-only state.
>
> To repro:
>
> emacs -Q
> M-x tab-bar-mode
> M-: (display-buffer-in-side-window (get-buffer "*Messages*") '((side . bottom)))
> C-x o
> M-x tab-new

Thanks for the bug report.

Martin, could you suggest how to ignore window-sideness
while splitting the side window?  'tab-bar-new-tab-to'
currently uses such trick to create a new window:

      (let ((ignore-window-parameters t))
        (delete-other-windows))
      (unless (eq tab-bar-new-tab-choice 'window)
        ;; Create a new window to get rid of old window parameters
        ;; (e.g. prev/next buffers) of old window.
        (split-window) (delete-window))

but this fails in side windows.

Message #11 received at 53662 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Juri Linkov <juri <at> linkov.net>
Cc: 53662 <at> debbugs.gnu.org, Aaron Jensen <aaronjensen <at> gmail.com>
Subject: Re: bug#53662: 29.0.50; Cannot use tab-new from side window
Date: Tue, 1 Feb 2022 09:09:54 +0100

> Martin, could you suggest how to ignore window-sideness
> while splitting the side window?  'tab-bar-new-tab-to'
> currently uses such trick to create a new window:
>
>        (let ((ignore-window-parameters t))
>          (delete-other-windows))

Usually, you can't make a side window the only window on its frame - the
main window has to stay.  If you ignore window parameters, you have to
clean the state of windows yourself afterwards - for example, by giving
the sole remaining window a 'window-side' parameter of nil.  If you do
not do that, the windows state of the frame is broken already before you
try splitting the window below.

>        (unless (eq tab-bar-new-tab-choice 'window)
>          ;; Create a new window to get rid of old window parameters
>          ;; (e.g. prev/next buffers) of old window.
>          (split-window) (delete-window))
>
> but this fails in side windows.

This is a hack and would fail in the case at hand since 'split-window'
would set the 'window-side' parameter for the new window.  I'd rather
set all parameters of the selected window to nil instead.

martin

Message #14 received at 53662 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: martin rudalics <rudalics <at> gmx.at>
Cc: 53662 <at> debbugs.gnu.org, Aaron Jensen <aaronjensen <at> gmail.com>
Subject: Re: bug#53662: 29.0.50; Cannot use tab-new from side window
Date: Tue, 01 Feb 2022 21:31:56 +0200

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

>> Martin, could you suggest how to ignore window-sideness
>> while splitting the side window?  'tab-bar-new-tab-to'
>> currently uses such trick to create a new window:
>>
>>        (let ((ignore-window-parameters t))
>>          (delete-other-windows))
>
> Usually, you can't make a side window the only window on its frame - the
> main window has to stay.  If you ignore window parameters, you have to
> clean the state of windows yourself afterwards - for example, by giving
> the sole remaining window a 'window-side' parameter of nil.  If you do
> not do that, the windows state of the frame is broken already before you
> try splitting the window below.
>
>>        (unless (eq tab-bar-new-tab-choice 'window)
>>          ;; Create a new window to get rid of old window parameters
>>          ;; (e.g. prev/next buffers) of old window.
>>          (split-window) (delete-window))
>>
>> but this fails in side windows.
>
> This is a hack and would fail in the case at hand since 'split-window'
> would set the 'window-side' parameter for the new window.  I'd rather
> set all parameters of the selected window to nil instead.

Thanks, I confirm this fixes the problem with this patch.
Also ‘split-window’ and ‘delete-window’ were moved
inside ‘(ignore-window-parameters t)’ for more safety:

[tab-new-window-parameters.patch (text/x-diff, inline)]

diff --git a/lisp/tab-bar.el b/lisp/tab-bar.el
index 06ad8f60af..43a56c806b 100644
--- a/lisp/tab-bar.el
+++ b/lisp/tab-bar.el
@@ -1361,12 +1361,17 @@ tab-bar-new-tab-to
       ;; Handle the case when it's called in the active minibuffer.
       (when (minibuffer-selected-window)
         (select-window (minibuffer-selected-window)))
+      ;; Remove all window parameters to prevent the case
+      ;; when e.g. `window-side' gets in the way.
+      (dolist (parameter (window-parameters))
+        (set-window-parameter nil (car parameter) nil))
       (let ((ignore-window-parameters t))
-        (delete-other-windows))
-      (unless (eq tab-bar-new-tab-choice 'window)
-        ;; Create a new window to get rid of old window parameters
-        ;; (e.g. prev/next buffers) of old window.
-        (split-window) (delete-window))
+        (delete-other-windows)
+        (unless (eq tab-bar-new-tab-choice 'window)
+          ;; Create a new window to get rid of old window parameters
+          ;; (e.g. prev/next buffers) of old window.
+          (split-window) (delete-window)))
+
       (let ((buffer
              (if (functionp tab-bar-new-tab-choice)
                  (funcall tab-bar-new-tab-choice)

Message #17 received at 53662 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Juri Linkov <juri <at> linkov.net>
Cc: 53662 <at> debbugs.gnu.org, Aaron Jensen <aaronjensen <at> gmail.com>
Subject: Re: bug#53662: 29.0.50; Cannot use tab-new from side window
Date: Wed, 2 Feb 2022 08:47:18 +0100

Two caveats:

+      (dolist (parameter (window-parameters))
+        (set-window-parameter nil (car parameter) nil))

Maybe you should remove the 'window-side' and the 'window-atom'
parameters only - users can assign arbitrary parameters to windows.

+        (unless (eq tab-bar-new-tab-choice 'window)
+          ;; Create a new window to get rid of old window parameters
+          ;; (e.g. prev/next buffers) of old window.
+          (split-window) (delete-window)))

Note that this will lose other settings as well like the window's
dedicated status.  If this is the intended behavior, you should at least
tell so in the doc-string.

martin

Message #20 received at 53662 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: martin rudalics <rudalics <at> gmx.at>
Cc: 53662 <at> debbugs.gnu.org, Aaron Jensen <aaronjensen <at> gmail.com>
Subject: Re: bug#53662: 29.0.50; Cannot use tab-new from side window
Date: Wed, 02 Feb 2022 21:37:09 +0200

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

> Two caveats:
>
> +      (dolist (parameter (window-parameters))
> +        (set-window-parameter nil (car parameter) nil))
>
> Maybe you should remove the 'window-side' and the 'window-atom'
> parameters only - users can assign arbitrary parameters to windows.

If other window parameters are harmless, then only these two could be
removed.

> +        (unless (eq tab-bar-new-tab-choice 'window)
> +          ;; Create a new window to get rid of old window parameters
> +          ;; (e.g. prev/next buffers) of old window.
> +          (split-window) (delete-window)))
>
> Note that this will lose other settings as well like the window's
> dedicated status.  If this is the intended behavior, you should at least
> tell so in the doc-string.

If you mean the case when tab-bar-new-tab-choice is 'window',
then it will lose only 'window-atom' and 'window-side', because
the value 'window' is intended to keep a single window on the tab.

In other cases at this point, all windows were already saved to
window-configuration, so this window is disposable and can be modified
before immediately deleting it.  After saving windows to
window-configuration, the task here is just to create a new window.

So now a new patch with the updated doc-string:

[tab-new-window-side.patch (text/x-diff, inline)]

diff --git a/lisp/tab-bar.el b/lisp/tab-bar.el
index 06ad8f60af..e611711092 100644
--- a/lisp/tab-bar.el
+++ b/lisp/tab-bar.el
@@ -474,6 +474,9 @@ tab-bar-new-tab-choice
 If t, start a new tab with the current buffer, i.e. the buffer
 that was current before calling the command that adds a new tab
 (this is the same what `make-frame' does by default).
+If the value is the symbol `window', then keep the selected
+window as a single window on the new tab, and keep all its
+window parameters except 'window-atom' and 'window-side'.
 If the value is a string, use it as a buffer name to switch to
 if such buffer exists, or switch to a buffer visiting the file or
 directory that the string specifies.  If the value is a function,
@@ -481,6 +484,7 @@ tab-bar-new-tab-choice
 If nil, duplicate the contents of the tab that was active
 before calling the command that adds a new tab."
   :type '(choice (const     :tag "Current buffer" t)
+                 (const     :tag "Current window" window)
                  (string    :tag "Buffer" "*scratch*")
                  (directory :tag "Directory" :value "~/")
                  (file      :tag "File" :value "~/.emacs")
@@ -1361,12 +1365,17 @@ tab-bar-new-tab-to
       ;; Handle the case when it's called in the active minibuffer.
       (when (minibuffer-selected-window)
         (select-window (minibuffer-selected-window)))
+      ;; Remove window parameters that can cause problems
+      ;; with `delete-other-windows' and `split-window'.
+      (set-window-parameter nil 'window-atom nil)
+      (set-window-parameter nil 'window-side nil)
       (let ((ignore-window-parameters t))
-        (delete-other-windows))
-      (unless (eq tab-bar-new-tab-choice 'window)
-        ;; Create a new window to get rid of old window parameters
-        ;; (e.g. prev/next buffers) of old window.
-        (split-window) (delete-window))
+        (delete-other-windows)
+        (unless (eq tab-bar-new-tab-choice 'window)
+          ;; Create a new window to get rid of old window parameters
+          ;; (e.g. prev/next buffers) of old window.
+          (split-window) (delete-window)))
+
       (let ((buffer
              (if (functionp tab-bar-new-tab-choice)
                  (funcall tab-bar-new-tab-choice)

Message #23 received at 53662 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: martin rudalics <rudalics <at> gmx.at>
Cc: 53662 <at> debbugs.gnu.org, Aaron Jensen <aaronjensen <at> gmail.com>
Subject: Re: bug#53662: 29.0.50; Cannot use tab-new from side window
Date: Sun, 06 Feb 2022 19:55:17 +0200

close 53662 29.0.50
thanks

>> Maybe you should remove the 'window-side' and the 'window-atom'
>> parameters only - users can assign arbitrary parameters to windows.
>
> If other window parameters are harmless, then only these two could be
> removed.

> So now a new patch with the updated doc-string:

Now this is pushed to master and closed.

Message #28 received at 53662 <at> debbugs.gnu.org (full text, mbox):

From: Aaron Jensen <aaronjensen <at> gmail.com>
To: Juri Linkov <juri <at> linkov.net>
Cc: martin rudalics <rudalics <at> gmx.at>, 53662 <at> debbugs.gnu.org
Subject: Re: bug#53662: 29.0.50; Cannot use tab-new from side window
Date: Sun, 6 Feb 2022 14:03:34 -0500

On Sun, Feb 6, 2022 at 1:00 PM Juri Linkov <juri <at> linkov.net> wrote:
>
> close 53662 29.0.50
> thanks
>
> >> Maybe you should remove the 'window-side' and the 'window-atom'
> >> parameters only - users can assign arbitrary parameters to windows.
> >
> > If other window parameters are harmless, then only these two could be
> > removed.
>
> > So now a new patch with the updated doc-string:
>
> Now this is pushed to master and closed.

Thank you for the quick fix. I have confirmed that this no longer
errors for my original use-case.

Best,

Aaron

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