XmStringSegmentCreate is a high-level function that assembles a compound
string consisting of a font list element tag, a direction component,
a text component, and an optional separator component.
text
Specifies a null-terminated string to be used as the text component of
the compound string.
tag
Specifies the font list element tag to be associated with the text.
The value XmFONTLIST_DEFAULT_TAG identifies a locale
text segment.
direction
Specifies the direction of the text.
separator
Specifies separator addition. If False, the compound string does not
have a separator at the end. If True, a separator immediately
follows the text component.