bug#65347: 29.1; Underscore in query replace prevents case-matching

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: sbaugh@janestreet.com,  65347@debbugs.gnu.org
> Date: Sat, 19 Aug 2023 10:52:02 -0400
> 
> So maybe what I want is something like:
> 
> 1. like we do now, highlight the text to be changed and ask y/n whether
>    to make the change (I likely won't see the exact question in the
>    minibuffer at that point).
> 2. if I say `y` but the capitalization of the change is the result of
>    guesswork, stop right after making the change, highlight it, and ask
>    again whether that was good, letting me edit it before continuing.

That's what ',' does, no?

> Similarly when I say `!` it should stop after every change that
> encountered a not-yet-seen capitalization.

Define "not yet seen capitalization".