5 files changed, 58 insertions, 12 deletions

diff --git a/src/qml/jsruntime/qv4qmlcontext.cpp b/src/qml/jsruntime/qv4qmlcontext.cpp
index 6aa0130188..969d44ecf6 100644
--- a/src/qml/jsruntime/qv4qmlcontext.cpp
+++ b/src/qml/jsruntime/qv4qmlcontext.cpp
@@ -539,7 +539,6 @@ ReturnedValue QQmlContextWrapper::lookupIdObject(Lookup *l, ExecutionEngine *eng
 
 ReturnedValue QQmlContextWrapper::lookupScopeObjectProperty(Lookup *l, ExecutionEngine *engine, Value *base)
 {
-    Q_UNUSED(base)
     Scope scope(engine);
     Scoped<QmlContext> qmlContext(scope, engine->qmlContext());
     if (!qmlContext)
@@ -560,12 +559,15 @@ ReturnedValue QQmlContextWrapper::lookupScopeObjectProperty(Lookup *l, Execution
     };
 
     ScopedValue obj(scope, QV4::QObjectWrapper::wrap(engine, scopeObject));
+
+    if (base)
+        *base = obj;
+
     return QObjectWrapper::lookupGetterImpl(l, engine, obj, /*useOriginalProperty*/ true, revertLookup);
 }
 
 ReturnedValue QQmlContextWrapper::lookupContextObjectProperty(Lookup *l, ExecutionEngine *engine, Value *base)
 {
-    Q_UNUSED(base)
     Scope scope(engine);
     Scoped<QmlContext> qmlContext(scope, engine->qmlContext());
     if (!qmlContext)
@@ -590,6 +592,10 @@ ReturnedValue QQmlContextWrapper::lookupContextObjectProperty(Lookup *l, Executi
     };
 
     ScopedValue obj(scope, QV4::QObjectWrapper::wrap(engine, contextObject));
+
+    if (base)
+        *base = obj;
+
     return QObjectWrapper::lookupGetterImpl(l, engine, obj, /*useOriginalProperty*/ true, revertLookup);
 }
 
diff --git a/src/qml/qml/qqmlmetatype.cpp b/src/qml/qml/qqmlmetatype.cpp
index 29b19b433f..0f8a850584 100644
--- a/src/qml/qml/qqmlmetatype.cpp
+++ b/src/qml/qml/qqmlmetatype.cpp
@@ -1641,7 +1641,14 @@ void qmlClearTypeRegistrations() // Declared in qqml.h
 #endif
 }
 
-static int registerAutoParentFunction(QQmlPrivate::RegisterAutoParent &autoparent)
+static void unregisterAutoParentFunction(const QQmlPrivate::AutoParentFunction &function)
+{
+    QMutexLocker lock(metaTypeDataLock());
+    QQmlMetaTypeData *data = metaTypeData();
+    data->parentFunctions.removeOne(function);
+}
+
+static int registerAutoParentFunction(const QQmlPrivate::RegisterAutoParent &autoparent)
 {
     QMutexLocker lock(metaTypeDataLock());
     QQmlMetaTypeData *data = metaTypeData();
@@ -1950,6 +1957,26 @@ int QQmlPrivate::qmlregister(RegistrationType type, void *data)
     return dtype.index();
 }
 
+void QQmlPrivate::qmlunregister(RegistrationType type, quintptr data)
+{
+    switch (type) {
+        case AutoParentRegistration:
+            unregisterAutoParentFunction(reinterpret_cast<AutoParentFunction>(data));
+            break;
+        case QmlUnitCacheHookRegistration:
+            QQmlMetaType::removeCachedUnitLookupFunction(
+                    reinterpret_cast<QmlUnitCacheLookupFunction>(data));
+            break;
+        case TypeRegistration:
+        case InterfaceRegistration:
+        case SingletonRegistration:
+        case CompositeRegistration:
+        case CompositeSingletonRegistration:
+            qmlUnregisterType(data);
+            break;
+    }
+}
+
 //From qqml.h
 bool qmlProtectModule(const char *uri, int majVersion)
 {
diff --git a/src/qml/qml/qqmlprivate.h b/src/qml/qml/qqmlprivate.h
index ae84803648..8a45de9f76 100644
--- a/src/qml/qml/qqmlprivate.h
+++ b/src/qml/qml/qqmlprivate.h
@@ -318,6 +318,7 @@ namespace QQmlPrivate
     };
 
     int Q_QML_EXPORT qmlregister(RegistrationType, void *);
+    void Q_QML_EXPORT qmlunregister(RegistrationType, quintptr);
 }
 
 QT_END_NAMESPACE
diff --git a/src/quick/items/qquickitemview.cpp b/src/quick/items/qquickitemview.cpp
index c20f778a8f..95f1229b92 100644
--- a/src/quick/items/qquickitemview.cpp
+++ b/src/quick/items/qquickitemview.cpp
@@ -1724,8 +1724,14 @@ void QQuickItemViewPrivate::refill()
 void QQuickItemViewPrivate::refill(qreal from, qreal to)
 {
     Q_Q(QQuickItemView);
-    if (!isValid() || !q->isComponentComplete())
+    if (!model || !model->isValid() || !q->isComponentComplete())
         return;
+    if (!model->count()) {
+        updateHeader();
+        updateFooter();
+        updateViewport();
+        return;
+    }
 
     do {
         bufferPause.stop();
@@ -1881,15 +1887,21 @@ void QQuickItemViewPrivate::layout()
 
         prepareVisibleItemTransitions();
 
-        for (QList<FxViewItem*>::Iterator it = releasePendingTransition.begin();
-             it != releasePendingTransition.end(); ) {
-            FxViewItem *item = *it;
-            if (prepareNonVisibleItemTransition(item, viewBounds)) {
-                ++it;
-            } else {
-                releaseItem(item);
+        for (auto it = releasePendingTransition.begin(); it != releasePendingTransition.end(); ) {
+            auto old_count = releasePendingTransition.count();
+            auto success = prepareNonVisibleItemTransition(*it, viewBounds);
+            // prepareNonVisibleItemTransition() may invalidate iterators while in fast flicking
+            // invisible animating items are kicked in or out the viewPort
+            // use old_count to test if the abrupt erasure occurs
+            if (old_count > releasePendingTransition.count()) {
+                continue;
+            }
+            if (!success) {
+                releaseItem(*it);
                 it = releasePendingTransition.erase(it);
+                continue;
             }
+            ++it;
         }
 
         for (int i=0; i<visibleItems.count(); i++)
diff --git a/src/quick/items/qquickitemview_p_p.h b/src/quick/items/qquickitemview_p_p.h
index 170027de87..89c0de704b 100644
--- a/src/quick/items/qquickitemview_p_p.h
+++ b/src/quick/items/qquickitemview_p_p.h
@@ -287,7 +287,7 @@ public:
             : item(i), moveKey(k) {}
     };
     QQuickItemViewTransitioner *transitioner;
-    QList<FxViewItem *> releasePendingTransition;
+    QVector<FxViewItem *> releasePendingTransition;
 
     mutable qreal minExtent;
     mutable qreal maxExtent;