commit https://github.com/vim/vim/commit/4b785f69c0616dba5d3f38e8ce4b5398cec89407 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Nov 29 21:54:44 2016 +0100 patch 8.0.0105 Problem: When using ch_read() with zero timeout, can't tell the difference between reading an empty line and nothing available. Solution: Add ch_canread().