bug#32159: 26.1; inhibit-compacting-font-caches does not fix all fonts lagging issue

[Eli Zaretskii]

> From: Andy Moreton <andrewjmoreton@gmail.com>
> Date: Tue, 17 Jul 2018 11:24:07 +0100
> 
> As a followup to the list Eli suggested, this works for me on Windows
> 10:
> 
>   (set-frame-font "DejaVu Sans Mono-9" nil t)
>   (dolist (fontspec-targets
>            '(;; Latin Extended Additional block (not supported by DejaVu Sans 
> Mono)
>              (("Liberation Mono"    . "iso10646-1") (#x1e00 . #x1eff))
>              ;; Other scripts
>              (("DejaVu Math Tex Gyre" . "iso10646-1") mathematical)
>              (("Segoe UI Symbol"    . "iso10646-1") braille symbol)
>              (("Myanmar Text"       . "iso10646-1") burmese)
>              (("Ebrima"             . "iso10646-1") ethiopic)
>              (("Microsoft Himalaya" . "iso10646-1") tibetan)
>              (("Leelawadee UI"      . "iso10646-1") khmer thai)
>              (("Gadugi"             . "iso10646-1") canadian-aboriginal 
> cherokee)
>              (("Nirmala UI"         . "iso10646-1") bengali devanagari 
> gujarati
>               kannada malayalam oriya sinhala tamil telugu)))
>     (dolist (target (cdr fontspec-targets))
>       (set-fontset-font "fontset-default" target (car fontspec-targets))))
> 
> That reduces the delay in showing the HELLO file from approx 20secs to
> approx 3secs on my box.

Some of these fonts (DejaVu Math, at least) don't come with Windows
OOTB.  More importantly, most of the others are not free, which is why
we don't want to mention them in our default fontset.