bug#37653: 26.3; edbug backquoted dot is space sensitive

[Juri Linkov]

>>                    (not (= (following-char) ?\;)))
>>               (memq (following-char) '(?\, ?\.)))))
>>
>> So it's explicitly allowing , after . here -- but surely that's wrong?
>> Or are there any circumstances that reading .,<foo> leads should lead to
>> a valid symbol?  Juri, do you remember this?  It's from 2004.  😀
>
> I've now made this parse like `read' does in Emacs 29.

Sorry, I don't remember. 🤷🏻‍♂️  I hope your change is right.