https://bugs.documentfoundation.org/show_bug.cgi?id=151121

--- Comment #5 from Caolán McNamara <[email protected]> ---
FWIW there are two levels of substitution.

Simple font substitution when the font isn't present at all which the top
layers sort of know about enough already to indicate with the fontname shown in
italic in the fontname boxes.

And glyph substitution where the font existed, but a glyph in it didn't. Higher
levels know pretty much nothing about glyph substitution and some of the
substitutions (driven by fontconfig) can be stuff like the bold variant doesn't
have the glyph but the regular one does so the glyph sub is the regular version
with fake "emboldening" applied to it.

bubbling up the info for a) probably isn't too hard, e.g. as tooltip info in
fontbox, b) is probably a PITA to achieve.

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