bug#21260: 23.2; Devanagari windows 10

[Eli Zaretskii <eliz@gnu.org>]

> Cc: 21260@debbugs.gnu.org
> From: Jim Funderburk <funderburk1@verizon.net>
> Date: Mon, 17 Aug 2015 16:16:21 -0400
> 
> 3.  Regarding fonts on windows 10 (from  Control Panel/Fonts):
>       a. Neither Mangal nor Kokila shows up
>       b. The only font that I see which mentions Devanagari and other 
> Indian languages is 'Nirmala UI'
>            Note: In light of your comment about Emacs and Indian 
> Language Fonts, this difference between Windows 10
>                       and prior versions of Windows may be the basis of 
> the problem.
>       c. When I set the Default Font to Nirmala UI,  Then the Devanagari 
> in the sample files displays properly !!

I found the Nirmala UI font on Windows 8.1 and looked at its OTF
features.  I think I know what causes the problem.  Please try
evaluating the following expression in "emacs -Q" immediately after
start, and then see whether display of Devanagari works okay after
that:

  (set-fontset-font "fontset-default" 'devanagari
                    (font-spec :registry "iso10646-1" :otf '(dev2 nil (rphf)))
                    nil 'prepend)

If the above doesn't work, try this instead:

  (set-fontset-font "fontset-default" 'devanagari "Nirmala UI" nil 'prepend)

If any of these work, you can put it in your .emacs init file to make
it permanent.