pub fn uncovered_glyphs(
chain: &FontChain<'_>,
chars: impl IntoIterator<Item = char>,
) -> Vec<char>Expand description
Every character in chars that does not render as itself in chain, in iteration order,
duplicates included.
For a scan over a whole repertoire (a demo’s UI text, a game’s glyph set) where a test wants
to name every offender in one failure rather than stopping at the first, as
assert_glyphs_covered does.