[Webkit-unassigned] [Bug 175778] New: Perform special handling for certain rare whitespace and control characters

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=175778

            Bug ID: 175778
           Summary: Perform special handling for certain rare whitespace
                    and control characters
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mmaxfield at apple.com
                CC: mmaxfield at apple.com

Currently, we treat these characters just like any other characters, which means we perform font selection, and possibly render the .notdef glyph. Instead, we should educate WebKit about these characters so that we don't need fonts for them (for performance) and to guarantee they won't render.

A few options:
U+200B ZERO WIDTH SPACE
U+FEFF
unicode bidi characters
U+2060 WORD JOINER
& more

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