commit https://github.com/vim/vim/commit/18b5d6df10a5f08ffebbec85a1cf2828871e3736 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Feb 28 19:30:24 2016 +0100 patch 7.4.1452 Problem: When a callback adds a syntax item either the redraw doesn't happen right away or in the GUI the cursor is in the wrong position for a moment. (Jakson Alves de Aquino) Solution: Redraw after the callback was invoked.