File fix-contextvars.patch of Package python-dill

From a84c1a6baf4ba3f8d119da7166a6624ace6b8fc0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miro=20Hron=C4=8Dok?= <miro@hroncok.cz>
Date: Thu, 22 May 2025 20:13:40 +0200
Subject: [PATCH] Pickle _contextvars.Context objects, for threads in Python
 3.14+

Fixes https://github.com/uqfoundation/dill/issues/716
---
 dill/_dill.py | 7 +++++++
 1 file changed, 7 insertions(+)

Index: dill-0.4.0/dill/_dill.py
===================================================================
--- dill-0.4.0.orig/dill/_dill.py
+++ dill-0.4.0/dill/_dill.py
@@ -54,6 +54,7 @@ OLD312a7 = (sys.hexversion < 0x30c00a7)
 import builtins as __builtin__
 from pickle import _Pickler as StockPickler, Unpickler as StockUnpickler
 from pickle import GLOBAL, POP
+from _contextvars import Context
 from _thread import LockType
 from _thread import RLock as RLockType
 try:
@@ -2119,6 +2120,12 @@ if HAS_CTYPES and hasattr(ctypes, 'pytho
 else:
     _testcapsule = None
 
+@register(Context)
+def save_context(pickler, obj):
+    logger.trace(pickler, "Cx: %s", obj)
+    pickler.save_reduce(Context, tuple(obj.items()), obj=obj)
+    logger.trace(pickler, "# Cx")
+
 
 #############################
 # A quick fix for issue #500