[fonttools/fonttools] 249302: Preserve mort state-table round trips

[Cosimo Lupo]

Branch: refs/heads/fix-mort-roundtrips
Home: https://github.com/fonttools/fonttools
Commit: 249302742915aa2d8dfb82a2246a46b269b5d4c3
https://github.com/fonttools/fonttools/commit/249302742915aa2d8dfb82a2246a46b269b5d4c3
Author: Cosimo Lupo <cos...@anthrotype.com>
Date: 2026-08-25 (Tue, 25 Aug 2026)

Changed paths:
M Lib/fontTools/ttLib/tables/otConverters.py
M Tests/ttLib/tables/_m_o_r_t_test.py

Log Message:
-----------
Preserve mort state-table round trips

Keep legacy ligature component rebase information in the model and TTX so zero offsets retain their original interpretation.

Infer the number of state-table classes from serialized transitions as well as glyph assignments.



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