bug#38457: 27.0.50; dabbrev-expand regression due to message change

[Juri Linkov]

>> I wanted to implement it earlier but had no time before.  I see no
>> problems with it.
>
> Let's not rock the boat too much so close to the release cycle because
> of a very minor problem which caused these changes.  You may not see
> any problems with it now, but I'm certain we will bump into numerous
> problems very soon if we make such significant changes in this
> infrastructure, which is used everywhere in Emacs.

There may be a misunderstanding here.  I was talking about the
changes for development in master, not for the release branch.
If you think it would be too risky to release with these changes,
then fine, these changes could be removed in the release branch.