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bug#44466: 27.1; quail input fails at read-only boundary

From: Evgeny Zajcev
Subject: bug#44466: 27.1; quail input fails at read-only boundary
Date: Sun, 8 Nov 2020 09:42:23 +0300

> 8 нояб. 2020 г., в 07:29, Eli Zaretskii <eliz@gnu.org> написал(а):
>> From: Evgeny Zajcev <lg.zevlg@gmail.com>
>> Date: Sun, 8 Nov 2020 01:24:26 +0300
>> Cc: dick <dick.r.chiang@gmail.com>, 44466@debbugs.gnu.org
>> What I want with that patch is that if some key is pressed on read-only area 
>> in non-read-only buffer, then
>> quail should do what it does as if buffer marked as read only, i.e. no input 
>> method translations are done, and
>> all single char bindings continue to work.
> When an input method is used in a read-only buffer, Emacs barfs
> because it doesn't allow inserting text into such a buffer.  It
> doesn't insert the untranslated character, as what your patch did.
>> Possible we need to check front-stickyness of the char at point along with 
>> 'read-only property:
>> ..
>>                   (and (get-char-property (point) 'read-only)
>>                        (get-char-property (point) 'front-sticky)))
> Does this solve the problem in this case?

Yes, because this mimics what is done in
verify_interval_modification() function from textprop.c.

Possibly the best solution would be to make
verify_interval_modification() visible from elisp side and use it in
quail-input-method to check for writability at point.


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