patch 8.0.1002: unnecessarily updating screen after timer callback commit https://github.com/vim/vim/commit/02e177d3e85e089ebdfba1a7d937150cffcb287a Author: Bram Moolenaar <Bram@vim.org> Date: Sat Aug 26 23:43:28 2017 +0200 patch 8.0.1002: unnecessarily updating screen after timer callback Problem: Unnecessarily updating screen after timer callback. Solution: Check if calling the timer sets must_redraw.