bug#81522: 32.0.50; dired-auto-toggle-b-switch problem with subdirectory and custom switches

> From: Filipp Gunbin <[email protected]>
> Date: Thu, 30 Jul 2026 18:19:38 +0300
> 
> This is a follow up to bug#81295, the relevant discussion is starting
> from this message:
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=81295#20.
> 
> In particular, here's some analysis and a possible way of fixing it:
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=81295#29.
> 
> 
> - mkdir -p ~/tmp/1/2
> 
> - emacs -Q -nw --eval "(setopt dired-auto-toggle-b-switch t)"
> 
> - C-x d ~/tmp/1 RET
> 
> - Create file with newline in name in subdir: M-! touch "2/a\nb.txt"
>   (C-q C-j for '\n')
> 
> - Type C-u i RET on directory '2' to open it in the same buffer.  In
>   bug#81295 the case of just "i" was fixed, this bug is about the case
>   with custom switches.
> 
> - Observe that the subdir is not inserted at all, and a warning is
>   displayed.  This happens only when 2 contains file with newlines.
> 
> Thanks.

Thanks, adding Stephen to the discussion.

> In GNU Emacs 32.0.50 (build 17, aarch64-apple-darwin25.5.0, NS
>  appkit-2685.60 Version 26.5.2 (Build 25F84)) of 2026-07-30 built on
>  mac2598
> Repository revision: fb6ad8aa780df52b01dc018a283b11db33ded906
> Repository branch: master
> System Description: macOS 26.5.2
> 
> 
> 
>