pdf-font: centralize whole-font fallback - #255
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Make Font::from_dictionary infallible and route every subtype parsing failure through one bundled TrueType fallback. Remove partial fallback program construction from TrueType and Type0 readers. Discard PDF widths, encoding, ToUnicode, and flags for substituted fonts so glyph lookup and advance widths come from the bundled cmap and hmtx tables. Limit nested font resources to parsed Type3 fonts. Co-authored-by: Codex <codex@openai.com>
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Make Font::from_dictionary infallible and route every subtype parsing failure through one bundled TrueType fallback. Remove partial fallback program construction from TrueType and Type0 readers.
Discard PDF widths, encoding, ToUnicode, and flags for substituted fonts so glyph lookup and advance widths come from the bundled cmap and hmtx tables. Limit nested font resources to parsed Type3 fonts.