From 0c82dc772834c178931b7a77767a194f29202b81 Mon Sep 17 00:00:00 2001
From: Albert Cervera i Areny <albert@nan-tic.com>
Date: Tue, 25 Aug 2020 17:38:35 +0200
Subject: [PATCH] Copy default dict in copy() methods.

---
 operation.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/operation.py b/operation.py
index 302283f..dc38d28 100644
--- a/operation.py
+++ b/operation.py
@@ -125,6 +125,8 @@ class Operation(sequence_ordered(), Workflow, ModelSQL, ModelView):
     def copy(cls, operations, default=None):
         if default is None:
             default = {}
+        else:
+            default = default.copy()
         default.setdefault('state', 'planned')
         default.setdefault('lines', [])
         return super(Operation, cls).copy(operations, default)