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Khaled Hosny authored
Merge marks, and other cluster extenders with the previous script. Logic copied from: https://searchfox.org/mozilla-central/rev/dbc0cd5615f9cd7337d3e05b7c3925af5f35c0ee/gfx/thebes/gfxScriptItemizer.cpp#113-122 Handling of script extensions is still missing as GLib does not seem to have an API to retrieve it. Fixes #739
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