Re: Making vertical-border char defcustom?

[Paul W. Rankin]

On 20 Jan 2020, at 1:35 am, Eli Zaretskii <address@hidden> wrote:
> 
>> From: Paul W. Rankin <address@hidden>
>> Date: Mon, 20 Jan 2020 00:13:27 +1000
>> 
>>   (defun prettify-vertical-border (&optional dummy)
>>     (ignore dummy)
>>     (set-display-table-slot
>>      (or buffer-display-table standard-display-table)
>>        'vertical-border ?│))
>> 
>>   (when (not window-system)
>>     (add-hook 'window-configuration-change-hook
>>               'prettify-vertical-border)
>>     (add-hook 'change-major-mode-hook
>>               'prettify-vertical-border))
>> 
>> However the problem with this approach is that some major/minor-modes
>> set their own overriding display-table... I think help-mode or
>> special-mode...
> 
> I don't understand the difficulty.  AFAIU, all you need is augment
> your prettify-vertical-border with a call to window-display-table, and
> then no overriding could get in your way.  Or am I missing something?

Ah sorry, the issue seems to be with some interference from a global minor mode 
page-break-lines-mode... Your suggestion helped me find that. Thanks.

Would the net benefit from making the vertical-border char defcustom still make 
it worthwhile? It seems similar to the recently added 
display-fill-column-indicator-character, a vertical line that sits next to the 
vertical border and is customisable.