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Jonas Jenwald 5e569cade5 Improve performance when reading very large TrueType "cmap" tables (issue 19319)

In the affected font the total number of mapping-entries is `1142348`, and no less than `997473` of them are duplicates.
Given that every duplicate causes a lot of Array elements to be moved this becomes extremely inefficient, which we can avoid by keeping track of seen `charCode`s and directly build the final mappings-Array instead.

2025-01-13 13:09:47 +01:00

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https://github.com/user-attachments/files/18396493/2023-ESG-report-eng.pdf