This is my NonMerge method:

Qt Code: 
  1. void TxTableModel::parseXml(const QByteArray &xml)
  2. {
  3.     QXmlInputSource inputSource;
  5.     TxSaxTableHandler handler(&m_Data, false);
  6.  
  7.     inputSource.setData(xml);
  8.     reader.setContentHandler(&handler);
  9.     reader.setErrorHandler(&handler);
  10.  
  11.     QModelIndexList selectedList = parent->selectionModel()->selectedRows();
  12.     QModelIndex scrollTopIndex = parent->indexAt(QPoint(1, 1));
  13.     QModelIndex scrollBottomIndex = parent->indexAt(QPoint(1, parent->height() - 1));
  14.  
  15.     beginResetModel();
  16.     m_Data.clearData();
  17.     reader.parse(inputSource);
  18.     endResetModel();
  19.  
  20.     if (scrollBottomIndex.row() == -1) {
  21.         parent->scrollToBottom();
  22.     } else {
  23.         parent->scrollTo(scrollTopIndex);
  24.     }
  25.  
  26.     if (selectedList.count() > 0 && (selectedList.at(0).row() >= scrollTopIndex.row()) && (scrollBottomIndex.row() == -1 || scrollBottomIndex.row() > selectedList.at(0).row() )) {
  27.         parent->selectRow(selectedList.at(0).row());
  28.     }
  29. }
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But I really hope that you would not use this. It makes me a lot of pain to support (edit cell is something terrible) and I`m working on merge too.