some utf8 chars are terrible small.

[Stephen J. Turnbull]

Uwe Brauer writes:

 >    > (defun ffi ()
 >    >   (interactive)
 >    >   (face-font-instance 'default nil (char-after (point))))

Try

(defun ffi ()
  (interactive)
  (face-font-instance 'default nil (char-charset (char-after (point)))))

This is due to the change in the API for specifier-matching-instance.