bug#45915: 28.2; delete-char deletes two letters

[Eli Zaretskii <eliz@gnu.org>]

> From: Tak Kunihiro <homeros.misasa@gmail.com>
> Cc: tkk@misasa.okayama-u.ac.jp
> Date: Sun, 18 Sep 2022 14:44:59 +0900
> 
> I see. I understand that 'display' properties on an org-table matters.
> I took a look for (org-table-align) and found that
> `org-table-separator-space' defines the text properties as shown below.
> 
> org-table.el: (defconst org-table-separator-space
> org-table.el:   (propertize " " 'display '(space :relative-width 1))
> org-table.el:   "Space used around fields when aligning the table.
> org-table.el: This space serves as a segment separator for the purposes of the
> org-table.el: bidirectional reordering.")

Yes, and that's exactly right for when the table could include
bidirectional (i.e. mixed L2R and R2L) text.

> Although I still do not understand the purpose of `:relative-width',
> problem disappeared with following configuration.
> 
>   (with-eval-after-load "org-table"
>     (setq org-table-separator-space " "))

I don't think this is the right solution.  One possible solution that
is better is to bind <Delete> to an org-table specific command, which
would insert some character displayed as a thin space between the two
spaces that have the 'display' property.  But I'll let Ihor chime in.

> I have an impression that default characters on
> org-table-separator-space is problematic.

What do you mean by "default characters"?