bug#56459: 29.0.50; Edebug disables Eldoc

[Eli Zaretskii]

> Cc: 56459@debbugs.gnu.org
> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Mon, 11 Jul 2022 12:49:12 +0200
> 
> Max Brieiev <max.brieiev@gmail.com> writes:
> 
> > 5. Observe that while you are typing any expression, eldoc does not
> >    display any hints in the echo area. (Same issue exists in any other
> >    elisp buffer with eldoc mode enabled, while Edebug is active.)
> 
> This is due to this code:
> 
> ;; Check various conditions about the current environment that might make
> ;; it undesirable to print eldoc messages right this instant.
> (defun eldoc-display-message-no-interference-p ()
>   "Return nil if displaying a message would cause interference."
>   (not (or executing-kbd-macro
>            (bound-and-true-p edebug-active)
> 
> This was added by:
> 
> commit 03a9c6d06a177fd9026779bcb952f906a7743690
> Author:     Noah Friedman <friedman@splode.com>
> AuthorDate: Mon Jul 24 00:38:34 2000 +0000
> 
>     (eldoc-display-message-no-interference-p): Don't interfere with edebug.
> 
> But it doesn't say in what way it interferes with edebug -- and removing
> that line, I don't really see any interference?  But eldoc messages
> things slightly different now than two decades ago...
> 
> Anybody know what this code is trying to do?

AFAIK nowadays 'message' displays echo-area messages in a way that
doesn't interfere with existing messages (it displays them in brackets
at the end of the existing text), so I think the original problem
should no longer exist.

Noah, can you verify that your original problem cannot be reproduced
if we remove the condition in eldoc-display-message-no-interference-p
that you added?