Re: Not able to display \u110BD and \u110CD in Emacs

[Eli Zaretskii <eliz@gnu.org>]

> From: समीर सिंह Sameer Singh <lumarzeli30@gmail.com>
> Date: Fri, 29 Apr 2022 16:47:22 +0530
> Cc: emacs-devel@gnu.org
> 
> They seem to be working after changing the devanagari font to Noto Sans Kaithi but only for one digit
> though

But that's what the rule you wrote says:

      (numerals "[\x966-\x96F]"))
  [...]
  (set-char-table-range composition-function-table
                        '(#x110BD . #x110BD)
                        (list (vector
                               (concat number-sign numerals)
                               0 'font-shape-gstring)))

The regexp in 'numerals' will match only a single character, so just
one character after number-sign will be composed.  if you want to
compose several ones, you need to say this instead:

      (numerals "[\x966-\x96F]+"))

> also they do not appear when alone.

Do they have any glyphs in the font?  Did you try to use
font-get-glyphs to see if the font can display those characters when
they are alone?

> Since the kaithi unicode does not have its own numerals and uses the devanagari ones, is there any way to
> only change the devanagari font when it is near the kaithi number signs?

That's what your composition rules already do: they are only triggered
when the character preceding the numerals is a number sign.  So I
don't think I understand the problem.

> 
> Here is the Text I entered, sorry for not including them earlier, I thought that mentioning their codepoints
> should be enough.
> KAITHI NUMBER SIGN: 𑂽
> KAITHI NUMBER SIGN + DEVANAGARI 0: 𑂽१
> 
> KAITHI NUMBER SIGN ABOVE: 𑃍
> KAITHI NUMBER SIGN ABOVE + DEVANAGARI 0: 𑃍०

When you put the cursor at the number sign character, don't you see a
thin 1-pixel space there?