[Webkit-unassigned] [Bug 205485] [Win] fast/text/stale-TextLayout-from-first-line.html is failing since Bug 204884

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205485

--- Comment #1 from Fujii Hironori <Hironori.Fujii at sony.com> ---
Created attachment 386177

  --> https://bugs.webkit.org/attachment.cgi?id=386177&action=review

simplified test case

&#x0300; doesn't show because
ComplexTextController::adjustGlyphsAndAdvances replaces a glyph
of &#x0300 with the space glyph.

stringIndices given by collectComplexTextRunsForCharacters are incorrect.

Uniscribe returns clusters.
For " &#x0300;", it returns [0 0]. This means both glyphs consist of a single cluster starting at 0th glyph.

Then, clusters are converted into stringIndices. It's [0 0].
This means both glyphs correspond to 0th charcther. This is incorrect.
ComplexTextController::adjustGlyphsAndAdvances replaces glyphs in the positions of space charcthers with the space glyph.

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