bug#44232: global-display-fill-column-indicator-mode vs. readonly buffers

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: 44232@debbugs.gnu.org,  jidanni@jidanni.org
> Date: Mon, 26 Oct 2020 19:51:59 +0100
> 
> No, you just need to load display-fill-column-indicator.el, like with
> any defcustom that belongs in that file, I think?  It's not
> ;;;###autoloaded...

Which means this defcustom is unlike any other: you cannot "M-x
customize-variable" it until you load the mode?  That's confusing, I
think.