[Webkit-unassigned] [Bug 172351] New: Glyphs substituted by "locl" table are unintentionally shaped upright in vertical writing mode.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=172351

            Bug ID: 172351
           Summary: Glyphs substituted by "locl" table are unintentionally
                    shaped upright in vertical writing mode.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: baba at bpsinc.jp
                CC: mmaxfield at apple.com

Created attachment 310642

  --> https://bugs.webkit.org/attachment.cgi?id=310642&action=review

Screenshot of Safari and Chrome (for comparison)

In the following example, all characters should be rendered sideways because all of them have "R" property of UTR#50.

https://jsbin.com/hohaxuqece/1/edit?html,css,output

However, the numbers (123) in the second line are rendered upright on Safari.

The problem occurs with Source Han Serif, but does not occur with Source Han Sans.

I found that the issue won't occur without "latin_special" lookup substitutions defined by:
https://github.com/adobe-fonts/source-han-serif/blob/master/Regular/features.JP#L2755

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