[Webkit-unassigned] [Bug 255710] New: Upright text in vertical lines doesn't segment correctly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=255710

            Bug ID: 255710
           Summary: Upright text in vertical lines doesn't segment
                    correctly
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: xfq.free at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

WebKit doesn't tailor grapheme cluster rules to take into account full orthographic syllables represented as conjuncts, upright characters in vertical lines of text don't break correctly.

See requirements at: https://w3c.github.io/ilreq/#h_vertical_arrangements_of_characters , but add to those the points made in https://w3c.github.io/i18n-drafts/questions/qa-indic-graphemes.en.html

Tests & results:
When devanagari characters are rendered upright in vertical text, orthographic syllables containing conjuncts are kept together: https://github.com/w3c/text_direction_tests/issues/10

An attempt has been made to keep conjuncts together, but pre-base consonants are rendered alone.

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