bug#47150: 28.0.50; Incorrect major-mode in minibuffer

[Alan Mackenzie]

Hello, Sheng.

On Sun, Mar 14, 2021 at 19:57:09 -0500, styang@fastmail.com wrote:
> The major-mode in the minibuffer is incorrectly set to
> fundamental-mode, even when it is the first one.

Why is fundamental-mode incorrect for a minibuffer, and what should the
major mode be instead?

What problems does fundamental-mode give you in a minibuffer?

> Reproduce with the following steps:

> 1. emacs -q
> 2. Eval the following:

> (defun report-major-mode ()
>   (message "mini-buffer major-mode is %s" major-mode))
> (add-hook 'minibuffer-setup-hook 'report-major-mode)

> 3. Press M-; to call eval-expression, which will report that the major-mode 
> is fundamental-mode


> The offending commit is 636ef445af.


> In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.26, 
> cairo version 1.17.4)
>  of 2021-03-12 built on Desktop
> Repository revision: 592fabdc7f8d9c52c931843a153fdac67a302c30
> Repository branch: makepkg
> Windowing system distributor 'System Description: Arch Linux

[ .... ]

-- 
Alan Mackenzie (Nuremberg, Germany).