bug#40690: 27.0.91; C-u M-! no longer inserts output at point

[Eli Zaretskii]

> From: Philipp Stephani <p.stephani2@gmail.com>
> Date: Sat, 18 Apr 2020 00:05:43 +0200
> 
> The help text for M-! says
> 
> "With prefix argument, insert the COMMAND’s output at point."
> 
> However, in Emacs 27 this is no longer the case if
> `shell-command-dont-erase-buffer' is `beg-last-out'.
> 
> Run
> 
> emacs -Q -eval "(setq shell-command-dont-erase-buffer 'beg-last-out)"
> 
> Hit M-< to go to the beginning of the scratch buffer.  Execute
> 
> C-u M-! echo hi RET
> 
> or any other command producing output.  In Emacs 26.3, the output is
> inserted at point, but in Emacs 27, it's inserted at the end of the
> buffer.

Thanks, I hope I fixed this now on the emacs-27 branch.