patch 8.2.2825: code in checkreadonly() not fully tested Commit: https://github.com/vim/vim/commit/2bf6034e5caf36b319148f46ba9a12e36c3bd41d Author: Dominique Pelle <dominique.pelle@gmail.com> Date: Sun May 2 20:16:24 2021 +0200 patch 8.2.2825: code in checkreadonly() not fully tested Problem: Code in checkreadonly() not fully tested. Solution: Add more tests. (Dominique Pell?, closes https://github.com/vim/vim/issues/8169)

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