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Fix sluggish display of symbols in UTF-8 language environment

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* lisp/international/fontset.el (setup-default-fontset): Make sure
Symbola and FreeMono are set up in the default fontset as belonging
to the "iso10646-1" registry.  In the UTF-8 locale, this avoids a
long and futile search for a suitable font, whose side effect is a
lot of consing, which then hits the font-cache compacting issue,
and causes very sluggish redisplay of characters displayed by
these fonts.  All this happens because the default for the
registry is "iso8859-1".  (Bug#24953)
This commit is contained in:
Eli Zaretskii 2016-11-16 18:11:33 +02:00
parent 1fc101b0c4
commit e992ac0a63
1 changed files with 3 additions and 2 deletions
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lisp/international/fontset.el
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@ -812,10 +812,11 @@
(#x1F700 . #x1F77F) ;; Alchemical Symbols
(#x1F780 . #x1F7FF) ;; Geometric Shapes Extended
(#x1F800 . #x1F8FF))) ;; Supplemental Arrows-C
(set-fontset-font "fontset-default" symbol-subgroup "Symbola" nil 'prepend))
(set-fontset-font "fontset-default" symbol-subgroup
'("Symbola" . "iso10646-1") nil 'prepend))
;; Box Drawing and Block Elements
(set-fontset-font "fontset-default" '(#x2500 . #x259F)
"FreeMono" nil 'prepend)
'("FreeMono" . "iso10646-1") nil 'prepend)
;; Since standard-fontset-spec on X uses fixed-medium font, which
;; gets mapped to a iso8859-1 variant, we would like to prefer its