patch 8.1.1246: cannot handle negative mouse coordinate from urxvt commit https://github.com/vim/vim/commit/bb7e1b4ba82eaa6f8c7a59f1314056e3c404437a Author: Bram Moolenaar <Bram@vim.org> Date: Thu May 2 20:24:12 2019 +0200 patch 8.1.1246: cannot handle negative mouse coordinate from urxvt Problem: Cannot handle negative mouse coordinate from urxvt. Solution: Accept '-' where a digit is expected. (Vincent Vinel, closes #4326)