bug#42708: Let users copy "*Char Help*" buffer

[Juri Linkov]

> There is a buffer "*Char Help*" that emacs makes sure the user is never
> able to copy. (What if Stallman found out about this?)

Actually you can copy it after signing an NDA.

> There is only one place that those "you are not allowed to copy" police
> cannot control: when viewed with emacs -nw. (Oops, I leaked it.) Else
> one's only option is a screenshot.

This patch should allow copying freely:

diff --git a/lisp/dired-aux.el b/lisp/dired-aux.el
index efb214088d..7bad4a720c 100644
--- a/lisp/dired-aux.el
+++ b/lisp/dired-aux.el
@@ -1266,7 +1266,7 @@ dired-query
                             (format " [Type yn!q or %s] "
                                     (key-description (vector help-char)))
                           " [Type y, n, q or !] ")))
-          (set sym (setq char (read-char-choice prompt char-choices)))
+          (set sym (setq char (read-char-from-minibuffer prompt char-choices)))
           (if (memq char '(?y ?\s ?!)) t)))))