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>
(cherry picked from commit 972580accdd0732b33947e8b1ca0ba8943041bdc)
Task-number: QTBUG-59500
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

1 files changed, 3 insertions, 2 deletions

diff --git a/src/corelib/kernel/qobject.cpp b/src/corelib/kernel/qobject.cpp
index 467b4c6780..6fd7d0202f 100644
--- a/src/corelib/kernel/qobject.cpp
+++ b/src/corelib/kernel/qobject.cpp
@@ -4760,11 +4760,12 @@ 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;
 }