Call disconnectNotify() when disconnecting a QMetaObject::Connection

In all other forms of disconnecting this is done. We also know the
signal index, so there is no reason not to do this.

Change-Id: Ic8b042cd8f45dbff74b42ee30c384a84bef78b20
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

2 files changed, 24 insertions, 4 deletions

diff --git a/src/corelib/kernel/qobject.cpp b/src/corelib/kernel/qobject.cpp
index ffb50ddac3..c0ebf273fa 100644
--- a/src/corelib/kernel/qobject.cpp
+++ b/src/corelib/kernel/qobject.cpp
@@ -4776,11 +4776,12 @@ bool QObject::disconnect(const QMetaObject::Connection &connection)
         c->isSlotObject = false;
     }
 
+    c->sender->disconnectNotify(QMetaObjectPrivate::signal(c->sender->metaObject(),
+                                                           c->signal_index));
+
     const_cast<QMetaObject::Connection &>(connection).d_ptr = 0;
     c->deref(); // has been removed from the QMetaObject::Connection object
 
-    // disconnectNotify() not called (the signal index is unknown).
-
     return true;
 }
 
diff --git a/tests/auto/corelib/kernel/qobject/tst_qobject.cpp b/tests/auto/corelib/kernel/qobject/tst_qobject.cpp
index 81d902ad20..9ee9c1f331 100644
--- a/tests/auto/corelib/kernel/qobject/tst_qobject.cpp
+++ b/tests/auto/corelib/kernel/qobject/tst_qobject.cpp
@@ -66,6 +66,7 @@ private slots:
     void connectDisconnectNotify();
     void connectDisconnectNotifyPMF();
     void disconnectNotify_receiverDestroyed();
+    void disconnectNotify_metaObjConnection();
     void connectNotify_connectSlotsByName();
     void connectDisconnectNotify_shadowing();
     void emitInDefinedOrder();
@@ -923,8 +924,7 @@ void tst_QObject::connectDisconnectNotifyPMF()
 
     // Test disconnectNotify when disconnecting by QMetaObject::Connection
     QVERIFY(QObject::disconnect(conn));
-    // disconnectNotify() is not called, but it probably should be.
-    QVERIFY(s->disconnectedSignals.isEmpty());
+    QVERIFY(!s->disconnectedSignals.isEmpty());
 
     // Test connectNotify when connecting by function pointer
     s->clearNotifications();
@@ -969,6 +969,25 @@ void tst_QObject::disconnectNotify_receiverDestroyed()
     delete s;
 }
 
+void tst_QObject::disconnectNotify_metaObjConnection()
+{
+    NotifyObject *s = new NotifyObject;
+    NotifyObject *r = new NotifyObject;
+
+    QMetaObject::Connection c = QObject::connect((SenderObject*)s, SIGNAL(signal1()),
+                                                 (ReceiverObject*)r, SLOT(slot1()));
+    QVERIFY(c);
+    QVERIFY(QObject::disconnect(c));
+
+    QCOMPARE(s->disconnectedSignals.count(), 1);
+    QCOMPARE(s->disconnectedSignals.at(0), QMetaMethod::fromSignal(&SenderObject::signal1));
+
+    delete r;
+    QCOMPARE(s->disconnectedSignals.count(), 1);
+
+    delete s;
+}
+
 class ConnectByNameNotifySenderObject : public QObject
 {
     Q_OBJECT