bug#69384: 30.0.50; :align-to and bidi-paragraph-direction interaction

[Eli Zaretskii <eliz@gnu.org>]

> From: Stephen Berman <stephen.berman@gmx.net>
> Cc: 69384@debbugs.gnu.org
> Date: Sun, 25 Feb 2024 22:18:10 +0100
> 
> > Sorry, this is still too vague.  What do you mean by "RTL text aligned
> > with LTR text"? "aligned" in what way and sense?
> >
> > How about an example of text showing what you want to do?  To avoid
> > strange effects of bidi reordering, please use lower-case letters to
> > represent LTR text and upper-case letters to represent RTL text.
> 
> The screenshot in my first post in this bug shows the alignment I want:
> the last (i.e. leftmost) character of the Arabic string occupies the
> same horizontal position (in this case, the leftmost column) as the
> first (i.e. leftmost) character of the English string.

Then why not use something like this:

  (let* ((a "السّلام عليكم")
	 (b "Hello")
	 (buf (get-buffer-create "Test1")))
    (with-current-buffer buf
      (erase-buffer)
      (setq bidi-paragraph-direction 'left-to-right)
      (insert "      " a
	      "\n\n"
	      "      " b)
      (switch-to-buffer buf)))

IOW, align with spaces and TABs.