bug#64439: 28.2; auto-fill-mode gets turned on all over the place

[David Howells]

Eli Zaretskii <eliz@gnu.org> wrote:

> Try evaluating this:
> 
>   (defun my-watcher (_symbol new-value operation where)
>     (error "auto-fill-mode: %s %s %s" new-value operation where))
>   (add-variable-watcher 'auto-fill-function 'my-watcher)
>   (debug-on-entry 'my-watcher)
> 
> and run your sessions with this.  Whenever auto-fill-mode is turned
> on, you will get a backtrace.

I restarted emacs and added the above.  I was editing some C code, pressed
enter and got:

        Debugger entered--entering a function:
        * my-watcher(auto-fill-function nil set nil)
          newline(nil 1)
          funcall-interactively(newline nil 1)
          command-execute(newline)

auto-fill-mode didn't seem to turn on, though - I'm not sure if that's to be
expected.  It's also not the first time I pressed enter in that buffer.

David