Added several tests for the rich_text._opt() method
--HG-- branch : 3.1
This pull request adds several tests for the _opt method in the CellRichText class.
This instance was upgraded to Heptapod 18.8.0 (final) on 2026-02-11
--HG-- branch : 3.1
This pull request adds several tests for the _opt method in the CellRichText class.