[Webkit-unassigned] [Bug 138213] Text positioning is wrong in ComplexTextControllerCoreText if left-most glyph has non-zero glyph position offsets

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=138213

--- Comment #1 from Behdad Esfahbod <behdad at google.com> ---
Ned, since you are listening:

I noticed that if I have a, eg RLE, at the beginning of a run of text, CoreText outputs a glyph with id 65535 there.  I imagine this is to help with cluster mapping...

One way to fix this bug for Webkit and others at the same time is, if the first glyph in buffer out from CoreText has non-zero offsets, prepend one of those invisible glyphs there.

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