commit https://github.com/vim/vim/commit/8f79acdf7ede2693fbda53c3c9693f16db4f193b Author: Bram Moolenaar <Bram@vim.org> Date: Fri Jan 1 14:48:20 2016 +0100 patch 7.4.1017 Problem: When there is a backslash in an option ":set -=" doesn't work. Solution: Handle a backslash better. (Jacob Niehus) Add a new test, merge in old test.

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# Test for vi) with cpo-M #2
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