chore(math): Fix probable bug w.r.t. glyph advance
chore(math): Fix probable bug w.r.t. glyph advance

In some places, the ink width of a glyph was used to compute a bounding
box, rather than the glyph advance, which seems to always be a bad idea.
It made a few things look bad and off-center, like big operators.

alerque/sile,alerque/sile,alerque/sile,alerque/sile