commit https://github.com/vim/vim/commit/2455c4ede8d4ff6f0754977b548708eec08869eb Author: Bram Moolenaar <Bram@vim.org> Date: Tue Sep 15 18:29:39 2015 +0200 patch 7.4.870 Problem: May get into an invalid state when using getchar() in an expression mapping. Solution: Anticipate mod_mask to change. (idea by Yukihiro Nakadaira)

README_src.txt for version 7.4 of Vim: Vi IMproved.

The source archive contains the files needed to compile Vim on Unix systems.
It is packed for Unix systems (NL line separator).

For more information, see the README.txt file that comes with the runtime
archive (vim-7.4-rt.tar.gz).  To be able to run Vim you MUST get the runtime
archive too!