[Libreoffice-bugs] [Bug 126754] New: Wrong OpenType tag for fractions in "font properties" dialog

[bugzilla-daemon at bugs.documentfoundation.org]

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: libreoffice-bugs at lists.freedesktop.org
          Reporter: rgb.mldc at gmail.com

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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