Expected: if a fontname work with FONTMETRIC()
then it must work with TXTWIDTH().

Observed: if the fontname have len() uppper to 64,
FONTMETRIC() work, TXTWIDTH() fail.

repro:

on error
? FONTMETRIC(1,PADR("Courier",65),8)
? TXTWIDTH("",PADR("Courier",65),8)