bug#70968: 29.2.50; choose-completion on an emacs22-style completion deletes text after point

[Eli Zaretskii <eliz@gnu.org>]

> Date: Mon, 26 Aug 2024 03:08:56 +0300
> Cc: sbaugh@janestreet.com, 70968@debbugs.gnu.org, juri@linkov.net,
>  monnier@IRO.UMontreal.CA
> From: Dmitry Gutov <dmitry@gutov.dev>
> 
> On 16/05/2024 21:25, Eli Zaretskii wrote:
> >> I don't think that would be required exactly.
> >>
> >> The problem here (IIUC) is that completion behaves differently with the
> >> emacs22 style depending on whether the execution path went through
> >> choose-completion (which is not a method of completion style but a
> >> common subroutine) or not (when completion--do-completion performed
> >> expansion).
> > I understand that much.  But what did these two (or their
> > then-equivalents) do in Emacs 22 and Emacs 23?
> 
> I'm guessing they behaved incorrectly (or however we want to call the 
> inconsistent behavior), but I don't have a compiled Emacs 22/23 around, 
> and they might be difficult to build.
> 
> Note that we fixed bug#48356 not too long ago, which is from the same 
> general area, and it probably originated from before Emacs 22/23 too.
> 
> It's worth looking for edge cases where we'd strongly prefer the current 
> behavior, and they might exist, but so far I only know of situations 
> where the change would be for the better, or the user might be okay with 
> either (example at the end of https://debbugs.gnu.org/72705#35).

Ping!  How should we proceed with this bug report?