patch 8.2.1121: command completion not working after ++arg

Problem:    Command completion not working after ++arg.
Solution:   Move skipping up. (Christian Brabandt, closes #6382)

src/cmdexpand.c

@@ -1099,6 +1099,15 @@ set_one_cmd_context(
 
     arg = skipwhite(p);
 
+    // Skip over ++argopt argument
+    if ((ea.argt & EX_ARGOPT) && *arg != NUL && STRNCMP(arg, "++", 2) == 0)
+    {
+	p = arg;
+	while (*p && !vim_isspace(*p))
+	    MB_PTR_ADV(p);
+	arg = skipwhite(p);
+    }
+
     if (ea.cmdidx == CMD_write || ea.cmdidx == CMD_update)
     {
 	if (*arg == '>')			// append
@@ -1146,14 +1155,6 @@ set_one_cmd_context(
 	arg = skipwhite(arg);
     }
 
-    // Skip over ++argopt argument
-    if ((ea.argt & EX_ARGOPT) && *arg != NUL && STRNCMP(arg, "++", 2) == 0)
-    {
-	p = arg;
-	while (*p && !vim_isspace(*p))
-	    MB_PTR_ADV(p);
-	arg = skipwhite(p);
-    }
 
     // Check for '|' to separate commands and '"' to start comments.
     // Don't do this for ":read !cmd" and ":write !cmd".

src/testdir/test_cmdline.vim

@@ -1593,8 +1593,11 @@ func Test_read_shellcmd()
     call feedkeys(":r! ++enc=utf-8 r\<c-a>\<c-b>\"\<cr>", 'tx')
     call assert_notmatch('^"r!.*\<runtest.vim\>', @:)
     call assert_match('^"r!.*\<rm\>', @:)
+
+    call feedkeys(":r ++enc=utf-8 !rm\<c-a>\<c-b>\"\<cr>", 'tx')
+    call assert_notmatch('^"r.*\<runtest.vim\>', @:)
+    call assert_match('^"r ++enc\S\+ !.*\<rm\>', @:)
   endif
 endfunc
 
-
 " vim: shiftwidth=2 sts=2 expandtab

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1121,
 /**/
     1120,
 /**/