vim-patch:7.4.1161

Problem:    ":argadd" without argument is supposed to add the current buffer
            name to the arglist.
Solution:   Make it work as documented. (Coot, closes vim/vim#577)

2faa29f896

src/nvim/ex_cmds.lua

@@ -88,7 +88,7 @@ return {
   },
   {
     command='argadd',
-    flags=bit.bor(BANG, NEEDARG, RANGE, NOTADR, ZEROR, FILES, TRLBAR),
+    flags=bit.bor(BANG, RANGE, NOTADR, ZEROR, FILES, TRLBAR),
     addr_type=ADDR_ARGUMENTS,
     func='ex_argadd',
   },