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| author | Kévin Le Gouguec <kevin.legouguec@gmail.com> | 2021-10-30 14:44:01 +0200 |
|---|---|---|
| committer | Lars Ingebrigtsen <larsi@gnus.org> | 2021-10-30 14:44:01 +0200 |
| commit | b54be604bf8ad67346a82a0755349ffa8a715a11 (patch) | |
| tree | 20515632e66de27503265ad9784c7a2d6fdffdbf /lisp/international/fontset.el | |
| parent | 3eaa873d239b568fa6a351a4f79c418d0049c8e3 (diff) | |
| download | emacs-b54be604bf8ad67346a82a0755349ffa8a715a11.tar.gz | |
Avoid fonts with incomplete coverage of MATHEMATICAL chars
* lisp/international/fontset.el (setup-default-fontset): Include both
ends of each sub-range in 'script-representative-chars' (bug#51495).
Some fonts include glyphs for MATHEMATICAL SCRIPT CAPITAL codepoints
(#x1D49C-#x1D4B5) but not for MATHEMATICAL SCRIPT SMALL codepoints
(#x1D4B6-#x1D4CF), see e.g. KpMath[1].
'script-representative-chars' must thus include both CAPITAL and SMALL
codepoints to ensure that we filter those fonts out.
Bug#51495; discussed in help-gnu-emacs[2].
[1] https://mirrors.ctan.org/fonts/kpfonts-otf/doc/unimath-kpfonts.pdf
[2] <878s02u5m6.fsf@gmail.com>
https://lists.gnu.org/archive/html/help-gnu-emacs/2021-09/msg00150.html
Diffstat (limited to 'lisp/international/fontset.el')
| -rw-r--r-- | lisp/international/fontset.el | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/lisp/international/fontset.el b/lisp/international/fontset.el index fcd22e09d29..7c3a7cd1a9e 100644 --- a/lisp/international/fontset.el +++ b/lisp/international/fontset.el @@ -816,11 +816,16 @@ (#x1D7EC #x1D7F5 mathematical-sans-serif-bold) (#x1D7F6 #x1D7FF mathematical-monospace))) (let ((slot (assq (nth 2 math-subgroup) script-representative-chars))) + ;; Add both ends of each subgroup to help filter out some + ;; incomplete fonts, e.g. those that cover MATHEMATICAL SCRIPT + ;; CAPITAL glyphs but not MATHEMATICAL SCRIPT SMALL ones. (if slot - (if (vectorp (cdr slot)) - (setcdr slot (vconcat (cdr slot) (vector (car math-subgroup)))) - (setcdr slot (vector (cadr slot) (car math-subgroup)))) - (setq slot (list (nth 2 math-subgroup) (car math-subgroup))) + (setcdr slot (append (list (nth 0 math-subgroup) + (nth 1 math-subgroup)) + (cdr slot))) + (setq slot (list (nth 2 math-subgroup) + (nth 0 math-subgroup) + (nth 1 math-subgroup))) (nconc script-representative-chars (list slot)))) (set-fontset-font "fontset-default" |