patch 8.2.2856: get readonly error for device that can't be written to Commit: https://github.com/vim/vim/commit/50157ef1c2e36d8696e79fd688bdd08312196bc6 Author: Bram Moolenaar <Bram@vim.org> Date: Sat May 15 23:21:05 2021 +0200 patch 8.2.2856: get readonly error for device that can't be written to Problem: Get readonly error for device that can't be written to. Solution: Check for being able to write first. (closes https://github.com/vim/vim/issues/8205)