1285277 - nsMathMLChar: Add a mapping from combining to non-combining equivalents

Status: NEW

(Core :: MathML, defect, P5)

Description

[Frédéric Wang (:fredw)]

Many math fonts provide stretch variants and assemblies for combining characters instead of their non-combining equivalent, contrary to what MathML says (https://www.w3.org/TR/MathML3/chapter7.html#chars.comb-chars). For example Latin Modern Math has ̲ U+0332 COMBINING LOW LINE but nothing for _ U+005F LOW LINE. We should have mapping from combining to non-combining forms in order to be able to use the corresponding variant and assemblies from these math fonts when nothing in the unicode table exists.