[Webkit-unassigned] [Bug 159917] New: Emoji variant selection changes with line wrapping

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=159917

            Bug ID: 159917
           Summary: Emoji variant selection changes with line wrapping
    Classification: Unclassified
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: OS X 10.11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Matthias.Wiesmann at gmail.com
                CC: simon.fraser at apple.com

Created attachment 283993
  --> https://bugs.webkit.org/attachment.cgi?id=283993&action=review
Small HTML example that reproduces the problem.

When emoji 263A is followed by a skin tone selector, the tone selector is not honoured, but this forces the display of the emoji style, i.e. implicitly the character is displayed as it were 263A FE0F. This behaviour changes if there is an line break between the emoji and the skin tone selector. So basically the appearance of the character changes according to the line breaking behaviour.
See the attached small HTML file which reproduces the issue. 

I'm not sure what the correct behaviour should be, but switching characters on the line breaking is wrong. 
Reasonable behaviours could be:
a) honour skin color modifier.
b) do not implicitly trigger the emoji variant when a skin tone selector is present and not honoured.
c) trigger the emoji variant regardless of line breaking.

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