Operator with arg need to make sure that they take arg to avoid crashing

Author: aycabta

lib/reline/line_editor.rb

@@ -735,7 +735,7 @@ def wrap_method_call(method_symbol, method_obj, key)
       not_insertion = method_symbol != :ed_insert
       process_insert(force: not_insertion)
     end
-    if @vi_arg
+    if @vi_arg and argumentable?(method_obj)
       method_obj.(key, arg: @vi_arg)
     else
       method_obj.(key)

test/reline/test_key_actor_vi.rb

@@ -1228,6 +1228,19 @@ def test_vi_delete_meta_with_vi_next_char
     assert_line('aaa bbb ___ ddd')
   end
 
+  def test_vi_delete_meta_with_arg
+    input_keys("aaa bbb ccc\C-[02w")
+    assert_byte_pointer_size('aaa bbb ')
+    assert_cursor(8)
+    assert_cursor_max(11)
+    assert_line('aaa bbb ccc')
+    input_keys('2dl') # TODO This should delete 2 chars.
+    assert_byte_pointer_size('aaa bbb ')
+    assert_cursor(8)
+    assert_cursor_max(10)
+    assert_line('aaa bbb cc')
+  end
+
   def test_vi_change_meta
     input_keys("aaa bbb ccc ddd eee\C-[02w")
     assert_byte_pointer_size('aaa bbb ')