fix(math): use stretchable U+203E for both over and underbar accents (SD-2408)#2639
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…(SD-2408) U+2015 (horizontal bar) doesn't stretch in MathML, so underbars on compound expressions like x+y only appeared under a single letter. Use U+203E (overline) for both — it's stretchable and munder/mover controls the position.
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U+2015 (horizontal bar) from SD-2403 fixed invisible underbars but doesn't stretch in MathML — so compound expressions like
a + b + conly showed the bar under a single letter.Use U+203E (overline) for both over and under bars. It's stretchable in MathML and
<munder>/<mover>controls the position, so the same character works for both.SD-2408