patch 8.0.0482: the setbufvar() function may mess up the window layout commit https://github.com/vim/vim/commit/2c90d51123fba44a90e09aa4a4f2b7d972dadb94 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Mar 18 22:35:30 2017 +0100 patch 8.0.0482: the setbufvar() function may mess up the window layout Problem: The setbufvar() function may mess up the window layout. (Kay Z.) Solution: Do not check the window to be valid if it is NULL.