https://bugs.documentfoundation.org/show_bug.cgi?id=126754
Bug ID: 126754
Summary: Wrong OpenType tag for fractions in "font properties"
dialog
Product: LibreOffice
Version: 6.3.0.4 release
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: Writer
Assignee: [email protected]
Reporter: [email protected]
Created attachment 153209
--> https://bugs.documentfoundation.org/attachment.cgi?id=153209&action=edit
Font features menu
OpenType defines two kinds of fractions, the "diagonal" fraction with the +frac
tag and the "nut" fraction with the tag +afrc
Character → Font tab → Features, LibreOffice offers "frac=1" for diagonal
fractions and "frac=2" for nut fractions, which is wrong: those are Graphite
tags, not OpenType tags, and they are valid only for Linux Libertine G and
Linux Biolinum G fonts (Graphite tags are not standardized).
Because of their similarity, LibreOffice understand both, "frac=1" and "frac=2"
as just "frac" which apply the diagonal OpenType fraction.
This wrong preset also generates problems with font preview when using some
fonts, because on 6.3 the "frac=1" is applied even if not explicitly selected
by the user, as you can see in the attached screenshot.
For the screenshot I'm using a font called Sukhumala that offer both, diagonal
and (some) nut fractions:
http://www.softerviews.org/Fonts.html#Sukhumala
Clearly, "frac=2" does not work to get nut fractions with Sukhumala, but "afrc"
does.
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