vim-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.

8f79acdf7e

src/nvim/version.c

@@ -667,7 +667,7 @@ static int included_patches[] = {
   // 1020 NA
   // 1019 NA
   // 1018,
-  // 1017,
+  1017,
   // 1016 NA
   1015,
   // 1014 NA