[Webkit-unassigned] [Bug 190290] New: Some combinations of Hebrew letters and vowel points display incorrectly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190290

            Bug ID: 190290
           Summary: Some combinations of Hebrew letters and vowel points
                    display incorrectly
           Product: WebKit
           Version: Safari 11
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: danielstephenson at olivetree.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 351622

  --> https://bugs.webkit.org/attachment.cgi?id=351622&action=review

PDF with screenshots (from Safari and Chrome) of each category of incorrect Hebrew display

Certain combinations of Hebrew letters, vowel points, and punctuation marks are not rendering correctly on some versions of Safari/Webkit. I can verify that I see this problem on Mac with High Sierra Version 10.13.5 and Safari Version 11.1.1 (13605.2.8). I also see this problem on iPhone, Version 11.4.1 (15G77). But I do not see the problem on iPad, Version 10.3.3 (16G60).

Specifics of the problem:
There are three combinations of Hebrew characters that fail to display correctly in newer versions of Webkit, but display correctly in older Webkit, and in Chrome or Firefox. These are:
1. Shin with dagesh (Unicode x05e9 + x05c1 + x05bc), followed by any vowel point or punctuation mark. This combination occurs 4747 times in the Hebrew Bible. The vowel point appears as a slight bulge on the left arm of the shin character. As an example see הַשָּׁמַ֖יִם, the fifth word in Genesis 1:1.
2. Sin with dagesh (Unicode x05e9 + x05c2 + x05bc), followed by any vowel point or punctuation mark. This combination occurs 1089 times in the Hebrew Bible. The vowel point appears as a slight bulge on the left arm of the sin character. As an example see הַשָּׂדֶ֖ה, the ninth word in Genesis 2:5.
3. Yod plus dagesh plus hiriq [Unicode x05d9 + x05bc + x05b4]. This combination occurs 4219 times in the Hebrew Bible. The hiriq is displayed above instead of below the baseline. As an example see וַיִּקְרָ֨א, the first word in Genesis 1:5. This may also interfere with subsequent vowel points or cantillation marks (atnah [Unicode x0591], occurs 68 times, or qamats [Unicode x05b8], occurs one time at 2 Samuel 3:2).

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