TAKAHASHI Naoto <firstname.lastname@example.org> and Ken'ichi Handa <email@example.com> write:
Mule creates a window whose size is based on the width of ASCII font. If the width of ASCII font and that of other fonts do not match, some characters are not displayed completely. The width of Japanese, Chinese, and Korean fonts must be exactly twice as wide as that of ASCII fonts; the width of other fonts must be same as that of ASCII fonts. If you see dirty characters on your screen, it may be caused by the auto-scaling function of X. If an X server receives a request of a font which does not exist but whose specification is LFD compliant, it tries to expand of reduce what is available. For example, a specification "-*-fixed-medium-r-*--*-*-*-*-*-*-jisx0208.1983-*" is LFD compliant, so it may be resized. On the other hand, a specification in mule-init.el: "-*-fixed-medium-r-*--*-*-jisx0208.1983-*" is not LFD compliant (the number of columns are less than it should to be), so auto-scaling is inhibited. (What is described here is what we have learned from experience, not from documents of X.