bug#8504: add more query-replace choice keys

[Lars Ingebrigtsen]

Juri Linkov <juri@linkov.net> writes:

>> When I run into these issues, I'm usually fine with most of the
>> replacements it's doing, but I just want a single (or a couple) of
>> replacements to be something specifically different, and having a new
>> command (like `e' or something) to do that would be handy.
>
> This would be nice mnemonics: `E' for case-sensitive editing,
> and `e' case-insensitive.

I've now done this in Emacs 29.

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