patch 8.0.0879: crash when shifting with huge number commit https://github.com/vim/vim/commit/bae5a17a738d1a3b5c51d9aa5d99e228d3911955 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Aug 6 15:42:06 2017 +0200 patch 8.0.0879: crash when shifting with huge number Problem: Crash when shifting with huge number. Solution: Check for overflow. (Dominique Pelle, closes https://github.com/vim/vim/issues/1945)