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bug#31666: Bad interaction between visual-line-mode and wrap-prefix on l


From: Clément Pit-Claudel
Subject: bug#31666: Bad interaction between visual-line-mode and wrap-prefix on long lines
Date: Fri, 8 Jun 2018 15:32:38 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0


On 2018-06-08 15:24, Eli Zaretskii wrote:
>> Date: Fri, 08 Jun 2018 21:32:03 +0300
>> From: Eli Zaretskii <address@hidden>
>> Cc: address@hidden
>>
>>> Cc: address@hidden
>>> From: Clément Pit-Claudel <address@hidden>
>>> Date: Fri, 8 Jun 2018 14:04:16 -0400
>>>
>>> How hard would it be to introduce a no-break text property?
> 
> Btw, would it be OK to use some non-ASCII whitespace character in
> these situations?  For example, you could use u+2002 (or even NBSP,
> u+0A0, if you reset nobreak-char-display to nil).

Maybe! Org-mode doesn't currently support it (it's fontification rules don't 
consider that case), but they could be changed.

One additional remark, which may explain why originally I attributed the issue 
to wrap-prefix.  The case in which the issue tends to be the most perceptible 
is when using org-mode with long URLs as titles and with 
adaptive-wrap-prefix-mode.  In that case, starting from

  |***** https://debbugs.gnu.org/cgi/bugreport.cgi?bug=31666

shrinking the window wraps like this:

  |***** 
  |      https://debbugs.gnu.org/cgi/bugre
  |      port.cgi?bug=31666

In that case, wrapping around the first space doesn't help, because the wrap 
prefix causes us to resume at exactly the same column on the next line.

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