Re: Fill column indicator functionality

[Eli Zaretskii <eliz@gnu.org>]

> Date: Fri, 5 Apr 2019 12:36:14 +0200
> From: Ergus <spacibba@aol.com>
> 
> The problem now is that I added it to cus-start.el but when I set it
> with the interface, the line does not change at all. Nothing really
> happens when I save.

Does invoking 'redisplay' (the function) fix that?

> >- when I turn it on, it chooses \u2502, which is not displayable by my
> >default font, but is displayable by a fallback font. I end up with
> >empty blocks at the end of each line. I can probably customize
> >'fill-column-face' to work around this, but Iʼd expect this to work by
> >default (either by using '|' or using the fallback font).
> >
> I don't really find a right method to fix this because the
> char-displayable-p function seems not to be accurate in many
> cases. There was a discussion about this before, but there was not a
> final agreement I think. And from the char-displayable-p documentation:
> 
> ```
> On a multi-font display, the test is only whether there is an
> appropriate font from the selected frame's fontset to display
> CHAR's charset in general.  Since fonts may be specified on a
> per-character basis, this may not be accurate.
> ```
> 
> Any suggestion here?

Once we have the details I requested from Robert.

> >- in org-mode buffers the indicator is displayed as '['. This may be
> >related to the previous point (those buffers use yet a third font).

How come '|' is displayed as '['?  What does Emacs show in *Help* if
you (Robert) go to that character and type "C-u C-x ="?