commit https://github.com/vim/vim/commit/7a84dbe6be0ef0e1ffbb7148cfe4ab50b9ba8f41 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Feb 7 21:29:00 2016 +0100 patch 7.4.1286 Problem: ch_open() with a timeout doesn't work correctly. Solution: Change how select() is used. Don't give an error on timeout. Add a test for ch_open() failing.