patch 8.1.0912: MS-Windows: warning for signed/unsigned commit https://github.com/vim/vim/commit/18442cbcc0d335a8ea6947e94eee9a2ab9552690 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Feb 13 21:22:12 2019 +0100 patch 8.1.0912: MS-Windows: warning for signed/unsigned Problem: MS-Windows: warning for signed/unsigned. Solution: Add type cast. (Nobuhiro Takasaki, closes https://github.com/vim/vim/issues/3945)