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

From: Juri Linkov
Subject: bug#42708: Let users copy "*Char Help*" buffer
Date: Thu, 06 Aug 2020 02:52:52 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (x86_64-pc-linux-gnu) 
>> -       (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)))))
>
> Makes sense to me...

Oh, I noticed it doesn't support 'C-h' that should pop up the buffer
" *Char Help*" from the dynamic variable 'help-form'.

Then maybe we should rewrite read-char-choice to use read-char-from-minibuffer?
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