Subject: bug#49971: 28.0.50; indent-tabs-mode not working globally

From: Eli Zaretskii <[email-masked]>
Date: Tue, 10 Aug 2021 14:57:18 +0300

> From: Gabriel <[email-masked]>
> Date: Mon, 09 Aug 2021 23:33:37 -0300
> 
> >> 1. emacs -Q
> >> 2. C-h v 'indent-tabs-mode' (value is t)
> >> 3. eval '(indent-tabs-mode -1)'
> >> 4. C-h v 'indent-tabs-mode' (local value is nil; global value is t)
> >
> > Where did you see that it's "defined as global"?
> 
> On simple.el:
> 
> (define-minor-mode indent-tabs-mode
>   "Toggle whether indentation can insert TAB characters."
>   :global t :group 'indent :variable indent-tabs-mode)

That's the mode, but in your recipe you are looking at the variable,
not the mode.  And the documentation of the variable clearly says:

  Automatically becomes buffer-local when set.