bug#50811: 28.0.50; Misleading Docstring for read-string function

[Lars Ingebrigtsen]

Codruț Constantin Gușoi <mail@codrut.pro> writes:

> If non-nil, second arg INITIAL-INPUT is a string to insert before reading.
>   This argument has been superseded by DEFAULT-VALUE and should normally be 
> nil
>   in new code.  It behaves as INITIAL-CONTENTS in `read-from-minibuffer' 
> (which
>   see).
> ```
>
> This is misleading since INITIAL-INPUT behaves differently from DEFAULT-VALUE:

The doc string isn't claiming that INITIAL-INPUT behaves like
DEFAULT-VALUE -- it says that you shouldn't use INITIAL-INPUT.

The point is that we want to move away from pre-filled prompts in Emacs,
and instead put the default in the "future history", i.e., say

(read-string "PROMPT " nil nil "B")

and then the user should `M-n' to edit the default.

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