Fixed #36468 -- Fixed failure to close popup when adding a related object in the admin.

The issue manifested when there were multiple relations and only some
of them participated in a filter_horizontal.

Regression in cd0479f.

Author: maqnius

django/contrib/admin/static/admin/js/admin/RelatedObjectLookups.js

@@ -111,7 +111,12 @@
                 option = new Option(newRepr, newId);
                 select.options.add(option);
                 // Update SelectBox cache for related fields.
-                if (window.SelectBox !== undefined && !SelectBox.cache[currentSelect.id]) {
+                if (
+                    window.SelectBox !== undefined
+                    && !SelectBox.cache[currentSelect.id]
+                    // Only if SelectBox is managing that field.
+                    && SelectBox.cache[select.id]
+                ) {
                     SelectBox.add_to_cache(select.id, option);
                     // Sort if there are any groups present
                     if (SelectBox.cache[select.id].some(item => item.group)) {

tests/admin_views/models.py

@@ -1196,3 +1196,7 @@ def __str__(self):
 class CamelCaseRelatedModel(models.Model):
     m2m = models.ManyToManyField(CamelCaseModel, related_name="m2m")
     fk = models.ForeignKey(CamelCaseModel, on_delete=models.CASCADE, related_name="fk")
+    # Add another relation that will not participate in filter_horizontal.
+    fk2 = models.ForeignKey(
+        CamelCaseModel, on_delete=models.CASCADE, related_name="fk2"
+    )