Font changes (but shouldn't) when switching to other split subwindow in emacs -

in .emacs, i've set larger font kanji, want retain smaller font hiragana , katakana:

(set-fontset-font "fontset-default" 'han "sazanami gothic:size=18") (set-fontset-font "fontset-default" '(#x3000 . #x30ff) "sans") 

that works when loading files etc.

when use horizontally split window, , switch other subwindow, font of hiragana in subwindow i'm leaving changes large font. because unicode ranges overlap, , order of definitions not respected? how should correctly specify ranges, i.e. can exclude range 'han, or need hunt down definition of 'han , correct ranges manually?

in general, fonts such buffer background , buffer foreground changed globally -- either on per frame basis or frames -- not on per buffer or per window basis. following 2 examples of how affect 1 buffer:

(defun buffer-background-red () (interactive)   (setq buffer-face-mode-face `(:background "red"))   (buffer-face-mode 1))  (defun zoom () (interactive)   (setq buffer-face-mode-face `(:height 375))   (buffer-face-mode 1))