bug#54804: 29.0.50; zap-to-char: case sensitive for upper-case letter

[Tino Calancha]

On Tue, 17 May 2022, Stefan Monnier wrote:

> > > I want the analog behavior for zap-to... commands: automatic
> > > case sensitivity when the char is uppercase.
> > > I want this behavior on interactive calls only, for instance when users
> > > do `M-z'.
> >
> > As I said I disagree: these are DWIMish features that are best
> > reserved for interactive invocation.  In calls from Lisp, it is
> > confusing to have the behavior change so drastically depending on the
> > letter-case of an argument.
>
> Am I misunderstanding something or are you two violently agreeing?

We both agree with a sword in a hand.

I don't want to change the behavior on Lisp call!
Just let me know the nice way to detect that the call is interactive and 
then I will inject the feature :-)