[4.0.x] Fixed #33159 -- Reverted "Fixed #32970 -- Changed WhereNode.clone() to create a shallow copy of children."

This reverts commit e441847eca.

A shallow copy is not enough because querysets can be reused and
evaluated in nested nodes, which shouldn't mutate JOIN aliases.

Thanks Michal Čihař for the report.
Backport of 903aaa35e5 from main

django/db/models/sql/where.py

@@ -148,7 +148,11 @@ class WhereNode(tree.Node):
         clone = self.__class__._new_instance(
             children=None, connector=self.connector, negated=self.negated,
         )
-        clone.children = self.children[:]
+        for child in self.children:
+            if hasattr(child, 'clone'):
+                clone.children.append(child.clone())
+            else:
+                clone.children.append(child)
         return clone
 
     def relabeled_clone(self, change_map):

tests/queries/tests.py

@@ -1663,6 +1663,12 @@ class Queries5Tests(TestCase):
             'bar %s'
         )
 
+    def test_queryset_reuse(self):
+        # Using querysets doesn't mutate aliases.
+        authors = Author.objects.filter(Q(name='a1') | Q(name='nonexistent'))
+        self.assertEqual(Ranking.objects.filter(author__in=authors).get(), self.rank3)
+        self.assertEqual(authors.count(), 1)
+
 
 class SelectRelatedTests(TestCase):
     def test_tickets_3045_3288(self):