[write-fonts] Graphviz improvements #612
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This adds the ability to set an env var ('FONTC_PRUNE_GRAPH') that
tells write-fonts to prune a generated dotviz file to only include
spaces that contain an overflow.
It also cleanups up our graphviz code to not use subgraphs, which
weren't adding much if anything.
anthrotype
reviewed
Sep 14, 2023
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This adds the ability to set an env var ('FONTC_PRUNE_GRAPH') that tells write-fonts to prune a generated dotviz file to only include spaces that contain an overflow. This was very helpful for debugging our PairPos format 2 packing failures.
It also cleanups up our graphviz code to not use subgraphs, which weren't adding much if anything.