diff --git a/src/corelib/kernel/qmetatype.h b/src/corelib/kernel/qmetatype.h
index 455d0350e01..4674efe5680 100644
--- a/src/corelib/kernel/qmetatype.h
+++ b/src/corelib/kernel/qmetatype.h
@@ -1381,7 +1381,7 @@ namespace QtPrivate
     };
 
     template<typename T, typename Enable = void>
-    struct IsGadgetHelper { enum { Value = false }; };
+    struct IsGadgetHelper { enum { IsRealGadget = false, IsGadgetOrDerivedFrom = false }; };
 
     template<typename T>
     struct IsGadgetHelper<T, typename T::QtGadgetHelper>
@@ -1389,11 +1389,14 @@ namespace QtPrivate
         template <typename X>
         static char checkType(void (X::*)());
         static void *checkType(void (T::*)());
-        enum { Value =  sizeof(checkType(&T::qt_check_for_QGADGET_macro)) == sizeof(void *) };
+        enum {
+            IsRealGadget = sizeof(checkType(&T::qt_check_for_QGADGET_macro)) == sizeof(void *),
+            IsGadgetOrDerivedFrom = true
+        };
     };
 
     template<typename T, typename Enable = void>
-    struct IsPointerToGadgetHelper { enum { Value = false }; };
+    struct IsPointerToGadgetHelper { enum { IsRealGadget = false, IsGadgetOrDerivedFrom = false }; };
 
     template<typename T>
     struct IsPointerToGadgetHelper<T*, typename T::QtGadgetHelper>
@@ -1402,7 +1405,10 @@ namespace QtPrivate
         template <typename X>
         static char checkType(void (X::*)());
         static void *checkType(void (T::*)());
-        enum { Value =  sizeof(checkType(&T::qt_check_for_QGADGET_macro)) == sizeof(void *) };
+        enum {
+            IsRealGadget = sizeof(checkType(&T::qt_check_for_QGADGET_macro)) == sizeof(void *),
+            IsGadgetOrDerivedFrom = true
+        };
     };
 
 
@@ -1435,12 +1441,12 @@ namespace QtPrivate
         static inline const QMetaObject *value() { return &T::staticMetaObject; }
     };
     template<typename T>
-    struct MetaObjectForType<T, typename std::enable_if<IsGadgetHelper<T>::Value>::type>
+    struct MetaObjectForType<T, typename std::enable_if<IsGadgetHelper<T>::IsGadgetOrDerivedFrom>::type>
     {
         static inline const QMetaObject *value() { return &T::staticMetaObject; }
     };
     template<typename T>
-    struct MetaObjectForType<T, typename QEnableIf<IsPointerToGadgetHelper<T>::Value>::Type>
+    struct MetaObjectForType<T, typename std::enable_if<IsPointerToGadgetHelper<T>::IsGadgetOrDerivedFrom>::type>
     {
         static inline const QMetaObject *value() { return &IsPointerToGadgetHelper<T>::BaseType::staticMetaObject; }
     };
@@ -1599,8 +1605,8 @@ namespace QtPrivate
 
 template <typename T, int =
     QtPrivate::IsPointerToTypeDerivedFromQObject<T>::Value ? QMetaType::PointerToQObject :
-    QtPrivate::IsGadgetHelper<T>::Value                    ? QMetaType::IsGadget :
-    QtPrivate::IsPointerToGadgetHelper<T>::Value           ? QMetaType::PointerToGadget :
+    QtPrivate::IsGadgetHelper<T>::IsRealGadget             ? QMetaType::IsGadget :
+    QtPrivate::IsPointerToGadgetHelper<T>::IsRealGadget    ? QMetaType::PointerToGadget :
     QtPrivate::IsQEnumHelper<T>::Value                     ? QMetaType::IsEnumeration : 0>
 struct QMetaTypeIdQObject
 {
@@ -1653,8 +1659,8 @@ namespace QtPrivate {
                      | (IsWeakPointerToTypeDerivedFromQObject<T>::Value ? QMetaType::WeakPointerToQObject : 0)
                      | (IsTrackingPointerToTypeDerivedFromQObject<T>::Value ? QMetaType::TrackingPointerToQObject : 0)
                      | (std::is_enum<T>::value ? QMetaType::IsEnumeration : 0)
-                     | (IsGadgetHelper<T>::Value ? QMetaType::IsGadget : 0)
-                     | (IsPointerToGadgetHelper<T>::Value ? QMetaType::PointerToGadget : 0)
+                     | (IsGadgetHelper<T>::IsGadgetOrDerivedFrom ? QMetaType::IsGadget : 0)
+                     | (IsPointerToGadgetHelper<T>::IsGadgetOrDerivedFrom ? QMetaType::PointerToGadget : 0)
              };
     };
 
diff --git a/src/corelib/tools/qscopedpointer.cpp b/src/corelib/tools/qscopedpointer.cpp
index 6c24e19bfaa..769a18f9e01 100644
--- a/src/corelib/tools/qscopedpointer.cpp
+++ b/src/corelib/tools/qscopedpointer.cpp
@@ -250,9 +250,12 @@ QT_BEGIN_NAMESPACE
 /*!
     \fn template <typename T, typename Cleanup> void QScopedPointer<T, Cleanup>::reset(T *other = 0)
 
-    Deletes the existing object it is pointing to if any, and sets its pointer to
+    Deletes the existing object it is pointing to (if any), and sets its pointer to
     \a other. QScopedPointer now owns \a other and will delete it in its
     destructor.
+
+    To clear the pointer held without deleting the object it points to (and hence take ownership
+    of the object), use \l take() instead.
 */
 
 /*!
diff --git a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
index 39d2857212a..0302d585b5e 100644
--- a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
+++ b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
@@ -956,7 +956,7 @@ void QXcbConnection::xi2UpdateScrollingDevice(ScrollingDevice &scrollingDevice)
         return;
     }
     QPointF lastScrollPosition;
-    if (lcQpaXInput().isDebugEnabled())
+    if (lcQpaXInputEvents().isDebugEnabled())
         lastScrollPosition = scrollingDevice.lastScrollPosition;
     for (int c = 0; c < deviceInfo->num_classes; ++c) {
         XIAnyClassInfo *classInfo = deviceInfo->classes[c];
diff --git a/src/plugins/platforms/xcb/qxcbwindow.cpp b/src/plugins/platforms/xcb/qxcbwindow.cpp
index e9a6e536a75..fed096f3114 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindow.cpp
@@ -2333,7 +2333,7 @@ void QXcbWindow::handleMotionNotifyEvent(const xcb_motion_notify_event_t *event)
 #if QT_CONFIG(xinput2)
 static inline int fixed1616ToInt(FP1616 val)
 {
-    return int((qreal(val >> 16)) + (val & 0xFFFF) / (qreal)0xFFFF);
+    return int(qreal(val) / 0x10000);
 }
 
 void QXcbWindow::handleXIMouseEvent(xcb_ge_event_t *event, Qt::MouseEventSource source)
diff --git a/src/widgets/widgets/qlabel.cpp b/src/widgets/widgets/qlabel.cpp
index 511db1a72c0..a6ae61545b8 100644
--- a/src/widgets/widgets/qlabel.cpp
+++ b/src/widgets/widgets/qlabel.cpp
@@ -963,7 +963,9 @@ bool QLabel::event(QEvent *e)
     if (type == QEvent::Shortcut) {
         QShortcutEvent *se = static_cast<QShortcutEvent *>(e);
         if (se->shortcutId() == d->shortcutId) {
-            QWidget * w = d->buddy;
+            QWidget *w = d->buddy;
+            if (!w)
+                return QFrame::event(e);
             if (w->focusPolicy() != Qt::NoFocus)
                 w->setFocus(Qt::ShortcutFocusReason);
 #if QT_CONFIG(abstractbutton)
@@ -1162,7 +1164,15 @@ void QLabelPrivate::updateLabel()
 void QLabel::setBuddy(QWidget *buddy)
 {
     Q_D(QLabel);
+
+    if (d->buddy)
+        disconnect(d->buddy, SIGNAL(destroyed()), this, SLOT(_q_buddyDeleted()));
+
     d->buddy = buddy;
+
+    if (buddy)
+        connect(buddy, SIGNAL(destroyed()), this, SLOT(_q_buddyDeleted()));
+
     if (d->isTextLabel) {
         if (d->shortcutId)
             releaseShortcut(d->shortcutId);
@@ -1203,6 +1213,13 @@ void QLabelPrivate::updateShortcut()
     shortcutId = q->grabShortcut(QKeySequence::mnemonic(text));
 }
 
+
+void QLabelPrivate::_q_buddyDeleted()
+{
+    Q_Q(QLabel);
+    q->setBuddy(nullptr);
+}
+
 #endif // QT_NO_SHORTCUT
 
 #if QT_CONFIG(movie)
diff --git a/src/widgets/widgets/qlabel.h b/src/widgets/widgets/qlabel.h
index e1cc333a1c8..2f5db5a7d3e 100644
--- a/src/widgets/widgets/qlabel.h
+++ b/src/widgets/widgets/qlabel.h
@@ -158,6 +158,9 @@ private:
 #endif
     Q_PRIVATE_SLOT(d_func(), void _q_linkHovered(const QString &))
 
+#ifndef QT_NO_SHORTCUT
+    Q_PRIVATE_SLOT(d_func(), void _q_buddyDeleted())
+#endif
     friend class QTipLabel;
     friend class QMessageBoxPrivate;
     friend class QBalloonTip;
diff --git a/src/widgets/widgets/qlabel_p.h b/src/widgets/widgets/qlabel_p.h
index e05a5b5c359..59188563a95 100644
--- a/src/widgets/widgets/qlabel_p.h
+++ b/src/widgets/widgets/qlabel_p.h
@@ -89,6 +89,7 @@ public:
 #endif
 #ifndef QT_NO_SHORTCUT
     void updateShortcut();
+    void _q_buddyDeleted();
 #endif
     inline bool needTextControl() const {
         return isTextLabel
diff --git a/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp b/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp
index cc628ee26e3..c6fd5d17c2d 100644
--- a/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp
+++ b/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp
@@ -141,6 +141,14 @@ public:
 class CustomNonQObject {};
 class GadgetDerived : public CustomGadget {};
 
+// cannot use Q_GADGET due to moc limitations but wants to behave like
+// a Q_GADGET in Qml land
+template<typename T>
+class GadgetDerivedAndTyped : public CustomGadget {};
+
+Q_DECLARE_METATYPE(GadgetDerivedAndTyped<int>)
+Q_DECLARE_METATYPE(GadgetDerivedAndTyped<int>*)
+
 void tst_QMetaType::defined()
 {
     QCOMPARE(int(QMetaTypeId2<QString>::Defined), 1);
@@ -157,6 +165,10 @@ void tst_QMetaType::defined()
     QVERIFY(!QMetaTypeId2<CustomNonQObject>::Defined);
     QVERIFY(!QMetaTypeId2<CustomNonQObject*>::Defined);
     QVERIFY(!QMetaTypeId2<CustomGadget_NonDefaultConstructible>::Defined);
+
+    // registered with Q_DECLARE_METATYPE
+    QVERIFY(QMetaTypeId2<GadgetDerivedAndTyped<int>>::Defined);
+    QVERIFY(QMetaTypeId2<GadgetDerivedAndTyped<int>*>::Defined);
 }
 
 struct Bar
@@ -396,6 +408,10 @@ void tst_QMetaType::typeName_data()
     QTest::newRow("CustomGadget*") << ::qMetaTypeId<CustomGadget*>() << QString::fromLatin1("CustomGadget*");
     QTest::newRow("CustomQObject::CustomQEnum") << ::qMetaTypeId<CustomQObject::CustomQEnum>() << QString::fromLatin1("CustomQObject::CustomQEnum");
     QTest::newRow("Qt::ArrowType") << ::qMetaTypeId<Qt::ArrowType>() << QString::fromLatin1("Qt::ArrowType");
+
+    // template instance class derived from Q_GADGET enabled class
+    QTest::newRow("GadgetDerivedAndTyped<int>") << ::qMetaTypeId<GadgetDerivedAndTyped<int>>() << QString::fromLatin1("GadgetDerivedAndTyped<int>");
+    QTest::newRow("GadgetDerivedAndTyped<int>*") << ::qMetaTypeId<GadgetDerivedAndTyped<int>*>() << QString::fromLatin1("GadgetDerivedAndTyped<int>*");
 }
 
 void tst_QMetaType::typeName()
@@ -1703,6 +1719,9 @@ void tst_QMetaType::metaObject_data()
     QTest::newRow("MyGadget*") << ::qMetaTypeId<MyGadget*>() << &MyGadget::staticMetaObject << false << true << false;
     QTest::newRow("MyEnum") << ::qMetaTypeId<MyGadget::MyEnum>() <<  &MyGadget::staticMetaObject << false << false << false;
     QTest::newRow("Qt::ScrollBarPolicy") << ::qMetaTypeId<Qt::ScrollBarPolicy>() <<  &QObject::staticQtMetaObject << false << false << false;
+
+    QTest::newRow("GadgetDerivedAndTyped<int>") << ::qMetaTypeId<GadgetDerivedAndTyped<int>>() <<  &GadgetDerivedAndTyped<int>::staticMetaObject << true << false << false;
+    QTest::newRow("GadgetDerivedAndTyped<int>*") << ::qMetaTypeId<GadgetDerivedAndTyped<int>*>() <<  &GadgetDerivedAndTyped<int>::staticMetaObject << false << true << false;
 }
 
 
diff --git a/tests/auto/corelib/tools/qvarlengtharray/tst_qvarlengtharray.cpp b/tests/auto/corelib/tools/qvarlengtharray/tst_qvarlengtharray.cpp
index ced1d08d65f..ac4c8c8d4e7 100644
--- a/tests/auto/corelib/tools/qvarlengtharray/tst_qvarlengtharray.cpp
+++ b/tests/auto/corelib/tools/qvarlengtharray/tst_qvarlengtharray.cpp
@@ -966,12 +966,14 @@ void tst_QVarLengthArray::insertMove()
         QCOMPARE(MyBase::liveCount, 4);
 
         vec.append(std::move(m3));
+        QVERIFY(m3.wasConstructedAt(nullptr));
         QVERIFY(vec.at(0).wasConstructedAt(&m3));
         QCOMPARE(MyBase::errorCount, 0);
         QCOMPARE(MyBase::liveCount, 4);
         QCOMPARE(MyBase::movedCount, 1);
 
         vec.push_back(std::move(m4));
+        QVERIFY(m4.wasConstructedAt(nullptr));
         QVERIFY(vec.at(0).wasConstructedAt(&m3));
         QVERIFY(vec.at(1).wasConstructedAt(&m4));
         QCOMPARE(MyBase::errorCount, 0);
@@ -979,6 +981,7 @@ void tst_QVarLengthArray::insertMove()
         QCOMPARE(MyBase::movedCount, 2);
 
         vec.prepend(std::move(m1));
+        QVERIFY(m1.wasConstructedAt(nullptr));
         QVERIFY(vec.at(0).wasConstructedAt(&m1));
         QVERIFY(vec.at(1).wasConstructedAt(&m3));
         QVERIFY(vec.at(2).wasConstructedAt(&m4));
@@ -987,9 +990,11 @@ void tst_QVarLengthArray::insertMove()
         QCOMPARE(MyBase::movedCount, 3);
 
         vec.insert(1, std::move(m2));
+        QVERIFY(m2.wasConstructedAt(nullptr));
         QVERIFY(vec.at(0).wasConstructedAt(&m1));
         QVERIFY(vec.at(1).wasConstructedAt(&m2));
         QVERIFY(vec.at(2).wasConstructedAt(&m3));
+        QVERIFY(vec.at(3).wasConstructedAt(&m4));
 
         QCOMPARE(MyBase::copyCount, 0);
         QCOMPARE(MyBase::liveCount, 4);
@@ -1014,15 +1019,19 @@ void tst_QVarLengthArray::nonCopyable()
     int *const ptr4 = val4.get();
 
     vec.append(std::move(val3));
+    QVERIFY(!val3);
     QVERIFY(ptr3 == vec.at(0).get());
     vec.append(std::move(val4));
+    QVERIFY(!val4);
     QVERIFY(ptr3 == vec.at(0).get());
     QVERIFY(ptr4 == vec.at(1).get());
     vec.prepend(std::move(val1));
+    QVERIFY(!val1);
     QVERIFY(ptr1 == vec.at(0).get());
     QVERIFY(ptr3 == vec.at(1).get());
     QVERIFY(ptr4 == vec.at(2).get());
     vec.insert(1, std::move(val2));
+    QVERIFY(!val2);
     QVERIFY(ptr1 == vec.at(0).get());
     QVERIFY(ptr2 == vec.at(1).get());
     QVERIFY(ptr3 == vec.at(2).get());
diff --git a/tests/auto/corelib/tools/qvector/tst_qvector.cpp b/tests/auto/corelib/tools/qvector/tst_qvector.cpp
index ef10357b6db..600291715a3 100644
--- a/tests/auto/corelib/tools/qvector/tst_qvector.cpp
+++ b/tests/auto/corelib/tools/qvector/tst_qvector.cpp
@@ -2895,26 +2895,40 @@ void tst_QVector::insertMove() const
     const int instancesCount = Movable::counter.loadAcquire();
     {
         QVector<Movable> vec;
+        vec.reserve(5);
+        Movable m0;
         Movable m1;
         Movable m2;
         Movable m3;
         Movable m4;
 
         vec.append(std::move(m3));
+        QVERIFY(m3.wasConstructedAt(nullptr));
         QVERIFY(vec.at(0).wasConstructedAt(&m3));
         vec.push_back(std::move(m4));
+        QVERIFY(m4.wasConstructedAt(nullptr));
         QVERIFY(vec.at(0).wasConstructedAt(&m3));
         QVERIFY(vec.at(1).wasConstructedAt(&m4));
         vec.prepend(std::move(m1));
+        QVERIFY(m1.wasConstructedAt(nullptr));
         QVERIFY(vec.at(0).wasConstructedAt(&m1));
         QVERIFY(vec.at(1).wasConstructedAt(&m3));
         QVERIFY(vec.at(2).wasConstructedAt(&m4));
         vec.insert(1, std::move(m2));
+        QVERIFY(m2.wasConstructedAt(nullptr));
         QVERIFY(vec.at(0).wasConstructedAt(&m1));
         QVERIFY(vec.at(1).wasConstructedAt(&m2));
         QVERIFY(vec.at(2).wasConstructedAt(&m3));
+        QVERIFY(vec.at(3).wasConstructedAt(&m4));
+        vec.push_front(std::move(m0));
+        QVERIFY(m0.wasConstructedAt(nullptr));
+        QVERIFY(vec.at(0).wasConstructedAt(&m0));
+        QVERIFY(vec.at(1).wasConstructedAt(&m1));
+        QVERIFY(vec.at(2).wasConstructedAt(&m2));
+        QVERIFY(vec.at(3).wasConstructedAt(&m3));
+        QVERIFY(vec.at(4).wasConstructedAt(&m4));
 
-        QCOMPARE(Movable::counter.loadAcquire(), instancesCount + 8);
+        QCOMPARE(Movable::counter.loadAcquire(), instancesCount + 10);
     }
     QCOMPARE(Movable::counter.loadAcquire(), instancesCount);
 }
diff --git a/tests/auto/other/compiler/tst_compiler.cpp b/tests/auto/other/compiler/tst_compiler.cpp
index 0410856790e..b2b45bb2377 100644
--- a/tests/auto/other/compiler/tst_compiler.cpp
+++ b/tests/auto/other/compiler/tst_compiler.cpp
@@ -693,7 +693,7 @@ QT_WARNING_DISABLE_GCC("-Wunused-local-typedefs")
 [[noreturn]] void attribute_f1();
 void attribute_f2 [[noreturn]] ();
 #  if (defined(__cpp_namespace_attributes) && __cpp_namespace_attributes >= 201411) && __has_cpp_attribute(deprecated)
-namespace NS [[deprecated]] { }
+namespace [[deprecated]] NS { }
 #  endif
 #endif
 
diff --git a/tests/auto/widgets/widgets/qlabel/tst_qlabel.cpp b/tests/auto/widgets/widgets/qlabel/tst_qlabel.cpp
index 500ec2e1fa8..84071962bca 100644
--- a/tests/auto/widgets/widgets/qlabel/tst_qlabel.cpp
+++ b/tests/auto/widgets/widgets/qlabel/tst_qlabel.cpp
@@ -178,9 +178,11 @@ void tst_QLabel::setBuddy()
     test_label= new QLabel( test_box );
     test_label->setText( "&Test with a buddy" );
     QWidget *test_edit = new QLineEdit( test_box );
+    QWidget *test_edit2 = new QLineEdit( test_box );
     QVBoxLayout *layout = new QVBoxLayout(test_box);
     layout->addWidget(test_label);
     layout->addWidget(test_edit);
+    layout->addWidget(test_edit2);
     test_box->show();
     qApp->setActiveWindow(test_box);
     QVERIFY(test_box->isActiveWindow());
@@ -190,6 +192,16 @@ void tst_QLabel::setBuddy()
     QVERIFY( !test_edit->hasFocus() );
     QTest::keyClick( test_box, 't', Qt::AltModifier );
     QVERIFY( test_edit->hasFocus() );
+
+    // Setting a new buddy should disconnect the old one's destroyed() signal
+    test_label->setBuddy(test_edit2);
+    delete test_edit;
+    QCOMPARE(test_label->buddy(), test_edit2);
+
+    // And deleting our own buddy should disconnect and not crash
+    delete test_edit2;
+    QTest::keyClick(test_box, 't', Qt::AltModifier );
+
     delete test_box;
 }
 #endif