BookmarksModel: Correctly store QModelIndex::internalId in data stream

See #1565

src/lib/bookmarks/bookmarksmodel.cpp

@@ -202,7 +202,7 @@ QMimeData* BookmarksModel::mimeData(const QModelIndexList &indexes) const
     foreach (const QModelIndex &index, indexes) {
         // If item's parent (=folder) is also selected, we will just move the whole folder
         if (index.isValid() && index.column() == 0 && !indexes.contains(index.parent())) {
-            stream << index.row() << (quint32) index.internalId();
+            stream << index.row() << index.internalId();
         }
     }
 
@@ -231,7 +231,13 @@ bool BookmarksModel::dropMimeData(const QMimeData* data, Qt::DropAction action,
 
     while (!stream.atEnd()) {
         int row;
-        quint32 id;
+
+#if QT_VERSION < 0x050000
+        qint64 id;
+#else
+        quintptr id;
+#endif
+
         stream >> row >> id;
         QModelIndex index = createIndex(row, 0, id);
         BookmarkItem* itm = item(index);