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bug#32257: 26.1; read-multiple-choice inf loops on mouse clicks


From: Andy Moreton
Subject: bug#32257: 26.1; read-multiple-choice inf loops on mouse clicks
Date: Tue, 31 Jul 2018 20:29:31 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (windows-nt)

On Tue 31 Jul 2018, Eli Zaretskii wrote:

>> From: Noam Postavsky <npostavs@gmail.com>
>> Cc: 32257@debbugs.gnu.org,  andrewjmoreton@gmail.com
>> Date: Mon, 30 Jul 2018 21:52:40 -0400
>> 
>> Another possibility is to use read-char-exclusive which only changes
>> ERROR_NON_ASCII to 0.  The downside is that when there are mouse clicks
>> it prints the events into the minibuffer, covering the prompt (but
>> typing "?"  still works to restore the prompt).

Only if you know in advance that typing "?" will do that.

>> --- i/lisp/emacs-lisp/rmc.el
>> +++ w/lisp/emacs-lisp/rmc.el
>> @@ -118,7 +118,7 @@ read-multiple-choice
>>                              choices)))
>>                    (condition-case nil
>>                        (let ((cursor-in-echo-area t))
>> -                        (read-char))
>> +                        (read-char-exclusive))
>>                      (error nil))))
>>            (setq answer (lookup-key query-replace-map (vector tchar) t))
>>            (setq tchar
>
> Maybe this is the best compromise for emacs-026.  We could search for
> a better (and bolder) solution on master.

This is no better than the status quo. Noam's original patch may bring
some possibility of new problems, but it does at least fix the original
problem (on emacs-26 and master).

    AndyM






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