Add QmlObjectListModel method to replace an entire model's data in one step

src/QmlControls/QmlObjectListModel.cc

@@ -179,6 +179,15 @@ void QmlObjectListModel::append(QObject* object)
     insert(_objectList.count(), object);
 }
 
+QObjectList QmlObjectListModel::swapObjectList(QObjectList newlist)
+{
+    QObjectList oldlist(_objectList);
+    beginResetModel();
+    _objectList = newlist;
+    endResetModel();
+    return oldlist;
+}
+
 int QmlObjectListModel::count(void) const
 {
     return rowCount();

src/QmlControls/QmlObjectListModel.h

@@ -37,6 +37,7 @@ public:
     void setDirty(bool dirty);
     
     void append(QObject* object);
+    QObjectList swapObjectList(QObjectList newlist);
     void clear(void);
     QObject* removeAt(int i);
     QObject* removeOne(QObject* object) { return removeAt(indexOf(object)); }