patch 8.0.0243: tolower() does not work if the byte count changes commit https://github.com/vim/vim/commit/cc5b22b3bfdc0e9e835cf7871166badda31447bd Author: Bram Moolenaar <Bram@vim.org> Date: Thu Jan 26 22:51:56 2017 +0100 patch 8.0.0243: tolower() does not work if the byte count changes Problem: When making a character lower case with tolower() changes the byte cound, it is not made lower case. Solution: Add strlow_save(). (Dominique Pelle, closes #1406)