[Backport] Fixing apply_order_updates method

taiga/projects/services/bulk_update_order.py

@@ -36,6 +36,11 @@ def apply_order_updates(base_orders: dict, new_orders: dict):
     The elements where no order update is needed will be removed.
     """
     updated_order_ids = set()
+
+    # Remove the elements from new_orders non existint in base_orders
+    invalid_keys = new_orders.keys() - base_orders.keys()
+    [new_orders.pop(id, None) for id in invalid_keys]
+
     # We will apply the multiple order changes by the new position order
     sorted_new_orders = [(k, v) for k, v in new_orders.items()]
     sorted_new_orders = sorted(sorted_new_orders, key=lambda e: e[1])

tests/unit/test_order_updates.py

@@ -161,3 +161,28 @@ def test_apply_order_updates_multiple_elements_duplicated_orders():
         "e": 5,
         "f": 6
     }
+
+
+def test_apply_order_invalid_new_order():
+    orders = {
+        "a": 1,
+        "b": 2,
+        "c": 3,
+        "d": 3,
+        "e": 3,
+        "f": 4
+    }
+    new_orders = {
+        "c": 3,
+        "d": 3,
+        "x": 3,
+        "a": 4
+    }
+    apply_order_updates(orders, new_orders)
+    assert orders == {
+        "c": 3,
+        "d": 3,
+        "a": 4,
+        "e": 5,
+        "f": 6
+    }