patch 8.1.1509: cmdline_row can become negative, causing a crash commit https://github.com/vim/vim/commit/954bb0636390751c0665d7d730a13d86dc5bc6e6 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jun 9 16:40:46 2019 +0200 patch 8.1.1509: cmdline_row can become negative, causing a crash Problem: Cmdline_row can become negative, causing a crash. Solution: Make sure cmdline_row does not become negagive. (closes https://github.com/vim/vim/issues/4102)