Fixed #11803 -- Allowed admin select widgets to display new related objects.

Adjusted admin javascript to add newly created related objects to
already loaded select widgets.

In this version, applies only where limit_choices_to is not set.

tests/admin_views/models.py

@@ -1098,3 +1098,39 @@ class Box(models.Model):
     next_box = models.ForeignKey(
         "self", null=True, on_delete=models.SET_NULL, blank=True
     )
+
+
+class Country(models.Model):
+    NORTH_AMERICA = "North America"
+    SOUTH_AMERICA = "South America"
+    EUROPE = "Europe"
+    ASIA = "Asia"
+    OCEANIA = "Oceania"
+    ANTARCTICA = "Antarctica"
+
+    CONTINENT_CHOICES = [
+        (NORTH_AMERICA, NORTH_AMERICA),
+        (SOUTH_AMERICA, SOUTH_AMERICA),
+        (EUROPE, EUROPE),
+        (ASIA, ASIA),
+        (OCEANIA, OCEANIA),
+        (ANTARCTICA, ANTARCTICA),
+    ]
+    name = models.CharField(max_length=80)
+    continent = models.CharField(max_length=13, choices=CONTINENT_CHOICES)
+
+    def __str__(self):
+        return self.name
+
+
+class Traveler(models.Model):
+    born_country = models.ForeignKey(Country, models.CASCADE)
+    living_country = models.ForeignKey(
+        Country, models.CASCADE, related_name="living_country_set"
+    )
+    favorite_country_to_vacation = models.ForeignKey(
+        Country,
+        models.CASCADE,
+        related_name="favorite_country_to_vacation_set",
+        limit_choices_to={"continent": Country.ASIA},
+    )