commit https://github.com/vim/vim/commit/44a2f923c00f1384c9ecde12fb5b4711bc20702e Author: Bram Moolenaar <Bram@vim.org> Date: Sat Mar 19 22:11:51 2016 +0100 patch 7.4.1611 Problem: The versplit feature makes the code uneccessary complicated. Solution: Remove FEAT_VERTSPLIT, always support vertical splits when FEAT_WINDOWS is defined.

start:
test for empty string: ok
test for 1 char: ok
test for 3 chars: ok
test for contains meta char: ok
test for contains non-ascii char: ok