Refs #32948 -- Added Node.__copy__().

This allows the copy.copy() usage in the Q._combine() method to finish
sooner, instead of having to fallback to using the __reduce_ex__(4)
method.

Thia also avoids having to fall into copy.copy() at in Q._combine(),
when combining a Q() with another Q().

Co-authored-by: Keryn Knight <keryn@kerynknight.com>

django/db/models/sql/where.py

@@ -183,9 +183,6 @@ class WhereNode(tree.Node):
         clone.relabel_aliases(change_map)
         return clone
 
-    def copy(self):
-        return self.clone()
-
     @classmethod
     def _contains_aggregate(cls, obj):
         if isinstance(obj, tree.Node):

django/utils/tree.py

@@ -44,6 +44,13 @@ class Node:
     def __repr__(self):
         return "<%s: %s>" % (self.__class__.__name__, self)
 
+    def __copy__(self):
+        obj = self.create(connector=self.connector, negated=self.negated)
+        obj.children = self.children  # Don't [:] as .__init__() via .create() does.
+        return obj
+
+    copy = __copy__
+
     def __deepcopy__(self, memodict):
         obj = self.create(connector=self.connector, negated=self.negated)
         obj.children = copy.deepcopy(self.children, memodict)