patch 8.2.2062: <Cmd> does not handle CTRL-V

Problem:    <Cmd> does not handle CTRL-V.
Solution:   Call get_literal() after encountering CTRL-V. (closes #7387)

src/getchar.c

@@ -3675,6 +3675,14 @@ getcmdkeycmd(
 	    }
 	    c1 = TO_SPECIAL(c1, c2);
 	}
+	if (c1 == Ctrl_V)
+	{
+	    // CTRL-V is followed by octal, hex or other characters, reverses
+	    // what AppendToRedobuffLit() does.
+	    no_reduce_keys = TRUE;  //  don't merge modifyOtherKeys
+	    c1 = get_literal();
+	    no_reduce_keys = FALSE;
+	}
 
 	if (got_int)
 	    aborted = TRUE;

src/testdir/test_mapping.vim

@@ -972,6 +972,11 @@ func Test_map_cmdkey()
   unmap <F3>
   unmap! <F3>
   %bw!
+
+  " command line ending in "0" is handled without errors
+  onoremap ix <cmd>eval 0<cr>
+  call feedkeys('dix.', 'xt')
+  ounmap ix
 endfunc
 
 " text object enters visual mode

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2062,
 /**/
     2061,
 /**/