https://bugs.documentfoundation.org/show_bug.cgi?id=155531
Bug ID: 155531
Summary: Kashida justification is disabled for AAT fonts
Product: LibreOffice
Version: 7.5.0.0 alpha0+
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: graphics stack
Assignee: [email protected]
Reporter: [email protected]
Since 7.5, we started using HarfBuzz API to check for places where inserting
Kashida would break the joining of the text.
However, HarfBuzz API handles only OpenType fonts, for fonts that use AAT
(Apple Advanced Typography) layout it marks all places unsuitable for Kashida
insertion.
This should ideally be fixed in HarfBuzz, but it is a hard problem
(https://github.com/harfbuzz/harfbuzz/issues/3721#issuecomment-1214410789).
Alternatively, we may skip the check for AAT fonts (there are not that many of
them, and they are mostly simple fonts where Kashida insertion will not break
the joining).
This includes Arabic fonts that ship with macOS (e.g. Al Bayan, Geeza Pro) and
third party fonts like http://wiki.irmug.com/index.php/X_Series_2.
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