bug#56459: 29.0.50; Edebug disables Eldoc

[Dmitry Gutov <dgutov@yandex.ru>]

On 28/02/2023 15:04, Eli Zaretskii wrote:
>> Date: Tue, 28 Feb 2023 04:15:41 +0200
>> Cc:max.brieiev@gmail.com,eliz@gnu.org,56459@debbugs.gnu.org
>> From: Dmitry Gutov<dgutov@yandex.ru>
>>
>> Hi Lars and others,
>>
>> On 01/08/2022 13:48, Lars Ingebrigtsen wrote:
>>>> and the behavior is still that only the edebug results are visible;
>>>> that is, eldoc's messages aren't covering up the edebug messages, but
>>>> they aren't showing up below them either and they're not even showing
>>>> up in any mode line.
>>>>
>>>> So the practical upshot is, I see no change in behavior; whatever
>>>> motivated that change seems to be a non-issue now.
>>> If I remove that check, I don't see any problems -- stepping through the
>>> code doesn't trigger eldoc, so there's no covering up of messages.  (But
>>> moving the cursor after stepping triggers eldoc, but that seems fine.)
>> What I'm seeing now, is stepping through Edebug often does invoke Eldoc,
>> which triggers messages which do override edebug evaluations.
>>
>> Which seems like a problem previously solved by that check.
> Maybe.  I also sometimes see this, but just now trying Edebug on a
> random function doesn't reproduce this.  Can you reproduce at will? if
> so, can you show a recipe?

Sure:

1) Visit an .rb file (with ruby-mode).
2) Instrument ruby-smie-rules with edebug.
3) Switch to .rb file again and press TAB somewhere where it would call 
ruby-mode's indentation code.
4) Step through ruby-smie-rules with SPC, not too quickly.

That happens with 'emacs -Q', no extra setup needed.