Gets the font ID for a face name paired with a default family. If the
mapping for the given pair is not already initialized, 0 is
returned. See also
find-or-create-font-id.
Font ID are useful only as mapping indices for
the-font-name-directory.
(send a-font-name-directory get-font-id namefamily)->exact integer name : string family : symbol in '(default decorative roman script swiss modern symbol system)
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