The predicate for dual-width fonts. This function is deprecated.
graphics-ports
font-dual-width-p port &optional font => result
| port⇩ | 
A graphics port. | 
| font⇩ | 
A font object. | 
| result | 
A boolean. | 
The function font-dual-width-p returns t if font is fixed-width and contains double width characters. Such a font is dual-width. font defaults to the font associated with port.
CAPI User Guide and Reference Manual (Unix version) - 01 Dec 2021 19:33:02