Justification Alternates (jalt) ignored by the HarfBuzz World-Ready shaping workflow
In the recent InDesign versions Adobe has introduced HarfBuzz as the default text shaping engine but the Justification alternates feature is now not working in OpenType fonts at all, we have confirmed it by testing with several Arabic fonts. For Adobe legacy text rendering engine this feature still works seamlessly but not for Harfbuzz
It has disturbed all the Arabic users past documents.
I have attached a test Arabic document with Adobe Naskh font, as this font has justification alternates feature.
Apply the World-Ready Paragraph Composer.
Justify the Arabic paragraph.
In Arabic Enabled InDesign set the Insert Kashidas to: None (image attached)
Enable Justification Alternates. (image attached)
Compare the broken result under HarfBuzz with the correct result under Legacy Text Shaping.
Muhammad Zuhair
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