Fixed #17401 -- Made SelectDateWidget.render reflect wrong value

Thanks Marcin Wrobel for the initial patch.

django/forms/widgets.py

@@ -977,10 +977,10 @@ class SelectDateWidget(Widget):
                         year_val, month_val, day_val = v.year, v.month, v.day
                     except ValueError:
                         pass
-                else:
+                if year_val is None:
                     match = self.date_re.match(value)
                     if match:
-                        year_val, month_val, day_val = [int(v) for v in match.groups()]
+                        year_val, month_val, day_val = [int(val) for val in match.groups()]
         html = {}
         choices = [(i, i) for i in self.years]
         html['year'] = self.create_select(name, self.year_field, value, year_val, choices, self.year_none_value)

tests/forms_tests/tests/test_widgets.py

@@ -1875,6 +1875,9 @@ class SelectDateWidgetTests(TestCase):
             """,
         )
 
+        # Even with an invalid date, the widget should reflect the entered value (#17401).
+        self.assertEqual(w.render('mydate', '2010-02-30').count('selected="selected"'), 3)
+
         # Years before 1900 work
         w = SelectDateWidget(years=('1899',))
         self.assertEqual(