patch 8.1.2289: after :diffsplit closing the window does not disable diff Commit: https://github.com/vim/vim/commit/c8234779790dd873acb88331c50988adf94cc383 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Nov 10 21:00:27 2019 +0100 patch 8.1.2289: after :diffsplit closing the window does not disable diff Problem: After :diffsplit closing the window does not disable diff. Solution: Add "closeoff" to 'diffopt' and add it to the default.