bug#31316: Emacs hangs in `font_open_entity'

[Lars Ingebrigtsen <larsi@gnus.org>]

Werner LEMBERG <wl@gnu.org> writes:

> If I call `emacs -Q' and load the attached file `testchar' with
>
>   C-x RET c gb18030 C-x C-f testchar
>
> Emacs hangs in `font_open_entity' on my GNU/Linux box:
>
>   for (psize = pixel_size; ; psize++)
>     {
>       font_object = driver_list->driver->open (f, entity, psize);
>       if (NILP (font_object))
>         return Qnil;
>       font = XFONT_OBJECT (font_object);
>       if (font->average_width > 0 && font->height > 0)
>         break;
>     }
>
> Both `average_width' and `height' are always zero for `font'
> regardless of `psize'; this effectively makes the above code an
> endless loop.

I tried reproducing this with Emacs 27 (on a Debian laptop), and I get
no hangs.  Are you still seeing this problem?

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