[Webkit-unassigned] [Bug 6137] New: Disable kerning and some ligatures in the ATSUI code path

[bugzilla-daemon at opendarwin.org]

http://bugzilla.opendarwin.org/show_bug.cgi?id=6137

           Summary: Disable kerning and some ligatures in the ATSUI code
                    path
           Product: WebKit
           Version: 412+
          Platform: Macintosh
        OS/Version: Mac OS X 10.4
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at opendarwin.org
        ReportedBy: opendarwin.org at mitzpettel.com
OtherBugsDependingO 5166
             nThis:


[Split off from bug 5166]
The ATSUI code path supports kerning pairs and ligatures. Until the CG code path supports these features, 
they should be disabled in the ATSUI code path, to ensure consistency in rendering and correct text 
metrics (otherwise highlighting can be wrong).

To see the problem, open the testcase.

The fix is to disable kerning and ligatures in the ATSUI code path, until they are supported in the CG code 
path (bug 6135 and bug 6136). A weak heuristic allows ligatures in fonts that are never expected to be 
used in the CG code path. This will hopefully minimize the effect on Arabic.

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