From 6df80e8762c4c7bd08434e203500aa4642123326 Mon Sep 17 00:00:00 2001
From: "Justin M. Keyes" <justinkz@gmail.com>
Date: Fri, 2 Feb 2018 21:48:10 +0100
Subject: [PATCH] vim-patch:8.0.0439: ":%argdel" gives an error for an empty
 arglist

Problem:    Using ":%argdel" while the argument list is already empty gives an
            error. (Pavol Juhas)
Solution:   Don't give an error. (closes vim/vim#1546)
https://github.com/vim/vim/commit/69a92fb5aecdf2f9d5f6947790b18991b22d0e4c

Also:
vim-patch:8.0.0473
---
 src/nvim/ex_cmds2.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/nvim/ex_cmds2.c b/src/nvim/ex_cmds2.c
index 28b021d4e4..0d3d68b855 100644
--- a/src/nvim/ex_cmds2.c
+++ b/src/nvim/ex_cmds2.c
@@ -1959,8 +1959,14 @@ void ex_argdelete(exarg_T *eap)
       eap->line2 = ARGCOUNT;
     }
     linenr_T n = eap->line2 - eap->line1 + 1;
-    if (*eap->arg != NUL || n <= 0) {
+    if (*eap->arg != NUL) {
+      // Can't have both a range and an argument.
       EMSG(_(e_invarg));
+    } else if (n <= 0) {
+      // Don't give an error for ":%argdel" if the list is empty.
+      if (eap->line1 != 1 || eap->line2 != 0) {
+        EMSG(_(e_invrange));
+      }
     } else {
       for (linenr_T i = eap->line1; i <= eap->line2; i++) {
         xfree(ARGLIST[i - 1].ae_fname);