Merge remote-tracking branch 'origin/5.3' into 5.4

Manually included changes from
3a347a4e70e5a10ee92dd2578316c926a399e894
in src/opengl/qgl.cpp.

Conflicts:
	src/opengl/qgl_qpa.cpp
	src/plugins/platforms/android/androidjnimain.cpp

Change-Id: Ic26b58ee587d4884c9d0fba45c5a94b5a45ee929

1 files changed, 8 insertions, 4 deletions

diff --git a/src/corelib/kernel/qobject.cpp b/src/corelib/kernel/qobject.cpp
index db2b086ff2..45bf4b62c5 100644
--- a/src/corelib/kernel/qobject.cpp
+++ b/src/corelib/kernel/qobject.cpp
@@ -4749,10 +4749,14 @@ bool QObject::disconnectImpl(const QObject *sender, void **signal, const QObject
     int signal_index = -1;
     if (signal) {
         void *args[] = { &signal_index, signal };
-        senderMetaObject->static_metacall(QMetaObject::IndexOfMethod, 0, args);
-        if (signal_index < 0 || signal_index >= QMetaObjectPrivate::get(senderMetaObject)->signalCount) {
-            qWarning("QObject::disconnect: signal not found in %s", senderMetaObject->className());
-            return false;
+        for (; senderMetaObject && signal_index < 0; senderMetaObject = senderMetaObject->superClass()) {
+            senderMetaObject->static_metacall(QMetaObject::IndexOfMethod, 0, args);
+            if (signal_index >= 0 && signal_index < QMetaObjectPrivate::get(senderMetaObject)->signalCount)
+                break;
+        }
+        if (!senderMetaObject) {
+            qWarning("QObject::disconnect: signal not found in %s", sender->metaObject()->className());
+            return QMetaObject::Connection(0);
         }
         signal_index += QMetaObjectPrivate::signalOffset(senderMetaObject);
     }