patch 8.2.0012: some undo functionality is not tested Commit: https://github.com/vim/vim/commit/559b9c68fe550f3af63d42e0838622aab1ceb1b3 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Dec 15 18:09:19 2019 +0100 patch 8.2.0012: some undo functionality is not tested Problem: Some undo functionality is not tested. Solution: Add a few more test cases. (Dominique Pelle, closes https://github.com/vim/vim/issues/5364)