patch 8.2.0646: t_Co uses the value of $COLORS in the GUI Commit: https://github.com/vim/vim/commit/759d81549c1340185f0d92524c563bb37697ea88 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Apr 26 16:52:49 2020 +0200 patch 8.2.0646: t_Co uses the value of $COLORS in the GUI Problem: t_Co uses the value of $COLORS in the GUI. (Masato Nishihata) Solution: Ignore $COLORS for the GUI. (closes https://github.com/vim/vim/issues/5992)