Re: Refresh display after changing variable

[Ken Goldman <kgoldman@us.ibm.com>]

On 8/2/2021 1:03 PM, Eli Zaretskii wrote:
>> From: Ken Goldman <kgoldman@us.ibm.com>
>> Date: Mon, 2 Aug 2021 12:49:41 -0400
>>
>> I have this to toggle a variable:
>>
>> (defun kg-toggle-whitespace-line-column ()
>>     "Toggle whitespace line column between 80 and 101"
>>     (interactive)
>>     (setq whitespace-line-column (if (= whitespace-line-column 80) 101 80))
>>     (font-lock-fontify-buffer))
>> (global-set-key "\C-cw" 'kg-toggle-whitespace-line-column)
>>
>> However, the buffer is not refreshed with the different colors.
>>
>> I also tried (refresh-display) - no success
>>
>> (revert-buffer) works but seems crude.
>>
>> What's the correct function?
> 
> This:
> 
>    (defun kg-toggle-whitespace-line-column ()
>       "Toggle whitespace line column between 80 and 101"
>       (interactive)
>       (setq whitespace-line-column (if (= whitespace-line-column 80) 101 80))
>       (whitespace-mode 1))
> 
> 
That didn't work.  It seems that, once it's on, turning it on again doesn't
help.  I tried adding a nil first, but it doesn't help.  It
doesn't force redoing the fonts.

This is emacs 26.3 on ubuntu, of that matters.