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.
Meet users and developers of Mercurial at the London Sprint, May 27-29th https://mercurial-scm.org/news/2026/0001-london-sprint
--HG-- branch : 3.1
This pull request adds several tests for the _opt method in the CellRichText class.