vim-patch:7.4.1123

Problem:    Using ":argadd" when there are no arguments results in the second
            argument to be the current one. (Yegappan Lakshmanan)
Solution:   Correct the w_arg_idx value.

a24f0a550f

src/nvim/version.c

@@ -559,7 +559,7 @@ static int included_patches[] = {
   // 1126,
   // 1125 NA
   // 1124 NA
-  // 1123,
+  1123,
   // 1122 NA
   // 1121,
   1120,