bug#33007: 27.0.50; Proposal for function to edit and return string

[Juri Linkov]

> The functions that (1) create and display the buffer
> and (2) process it (e.g. a command bound to `C-c C-c',
> by default) or cancel it should be usable in various
> ways, for buffer content of various kinds and for
> processing of various kinds.

Or to add a new arg to the existing standard functions like read-string
that will force them to use the bottom side window for reading (like the
bottom window is used for *Completions*) instead of the minibuffer.