bug#64420: string-width of … is 2 in CJK environments

[Dmitry Gutov <dmitry@gutov.dev>]

On 12/08/2023 08:50, Eli Zaretskii wrote:
>> Date: Sat, 12 Aug 2023 02:52:29 +0300
>> Cc:itaemu@gmail.com,casouri@gmail.com,64420@debbugs.gnu.org
>> From: Dmitry Gutov<dmitry@gutov.dev>
>>
>> On 05/08/2023 18:01, Eli Zaretskii wrote:
>>> OK, this is now installed on master.  We have a new user option named
>>> cjk-ambiguous-chars-are-wide; its default is t, but if set to nil, the
>>> characters proclaimed by Unicode as "ambiguous" will have char-width
>>> of 1, not 2.  Note that this option should be set either via 'setopt'
>>> or the Customize interface, not via 'setq'.
>>>
>>> Let me know how well this works for you.
>> Seems to work fine, thank you.
>>
>> With the caveat that, in the terminal, if I switch to Chinese-BIG5 and
>> visit a file with ambiguous characters like … (which triggers some bugs
>> with display and navigation around those chars), (setopt
>> cjk-ambiguous-chars-are-wide nil) doesn't fix those bugs -- I have to
>> kill and re-visit the buffer for them to go away. But maybe that's expected.
> Does "M-x redraw-display RET" solve the problem after setting the
> variable?

Looks like it does, yes.