Overtall font in modeline slops over into frame

Anybody know if this is a font bug or an XEmacs bug? It occasionally obscures text. :-( Note how the Canna modeline indicator at the left end of the line extends into the window above. (Thank you Debian for screwing up my fontpath again....) -- University of Tsukuba Tennodai 1-1-1 Tsukuba 305-8573 JAPAN Institute of Policy and Planning Sciences Tel/fax: +81 (298) 53-5091 _________________ _________________ _________________ _________________ What are those straight lines for? "XEmacs rules."