[pygi] Only hookup vfunc implementations for locally-defined methods

[Tomeu Vizoso <tomeuv src gnome org>]

commit 5e20c018ae09a936f5ff140df5d1c133c98e98ba
Author: Tomeu Vizoso <tomeu sugarlabs org>
Date:   Thu Apr 29 13:09:03 2010 +0200

    Only hookup vfunc implementations for locally-defined methods
    
    https://bugzilla.gnome.org/show_bug.cgi?id=617160

 gi/types.py      |   10 +++++++++-
 tests/test_gi.py |   10 ++++++++++
 2 files changed, 19 insertions(+), 1 deletions(-)
---
diff --git a/gi/types.py b/gi/types.py
index 78b126d..23c44ea 100644
--- a/gi/types.py
+++ b/gi/types.py
@@ -104,10 +104,18 @@ class MetaClassHelper(object):
                             'the method do_%s()' % (base.__info__.get_namespace(),
                                                     base.__info__.get_name(),
                                                     vfunc_info.get_name()))
-                elif vfunc is not None:
+                elif vfunc is not None and not \
+                        is_function_in_classes(vfunc.im_func, cls.__bases__):
                     hook_up_vfunc_implementation(vfunc_info, cls.__gtype__,
                                                  vfunc)
 
+def is_function_in_classes(function, classes):
+    for klass in classes:
+        if function in klass.__dict__.values():
+            return True
+        elif is_function_in_classes(function, klass.__bases__):
+            return True
+    return False
 
 class GObjectMeta(gobject.GObjectMeta, MetaClassHelper):
 
diff --git a/tests/test_gi.py b/tests/test_gi.py
index 2c596be..3db562d 100644
--- a/tests/test_gi.py
+++ b/tests/test_gi.py
@@ -1476,6 +1476,16 @@ class TestInterfaces(unittest.TestCase):
         GIMarshallingTests.test_interface_test_int8_in(instance, 42)
         self.assertEquals(instance.val, 42)
 
+        class TestInterfaceImplA(TestInterfaceImpl):
+            __gtype_name__ = 'TestInterfaceImplA'
+
+        class TestInterfaceImplB(TestInterfaceImplA):
+            __gtype_name__ = 'TestInterfaceImplB'
+
+        instance = TestInterfaceImplA()
+        GIMarshallingTests.test_interface_test_int8_in(instance, 42)
+        self.assertEquals(instance.val, 42)
+
 class TestOverrides(unittest.TestCase):
 
     def test_constant(self):