Merge pull request #548 from HwangTaehyun/main

Fix the validate of form should pass extra_validators

src/flask_wtf/form.py

@@ -83,7 +83,7 @@ def validate_on_submit(self, extra_validators=None):
  """Call :meth:`validate` only if the form is submitted.
  This is a shortcut for ``form.is_submitted() and form.validate()``.
  """
- return self.is_submitted() and self.validate(extra_validators)
+ return self.is_submitted() and self.validate(extra_validators=extra_validators)
 
  def hidden_tag(self, *fields):
  """Render the form's hidden fields in one call.