QItemSelection, does not copy all area

Hi, I have strange problem. I have two class: mainWindow inherits by QMainWindow, and myWidget inherits by QWidget. In mainWindow class i create model, and myWidget class i create QTableView. Now i would like copy selection, but not in myWidget, only mainWindow class, so i did something like this in myWidget:

Code:

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connect(table->selectionModel(),SIGNAL(
      selectionChanged(const QItemSelection &,const QItemSelection &)),
          this,SIGNAL(updateSelect(const QItemSelection &,const QItemSelection &)));

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And in mainWindow:

Code:

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connect(widget,SIGNAL(updateSelect(const QItemSelection &,const QItemSelection &)),
          this,SLOT(updateSelection(const QItemSelection&,const QItemSelection &)));
 
void mainWindow::updateSelection(const QItemSelection &selection,const QItemSelection &){
  this->selection = selection;
}
 
void mainWindow::copyCells(){
  QList<QItemSelectionRange> models = selection;
  if(models.isEmpty())
    return;
  QModelIndex start = models[0].topLeft();
  QModelIndex stop = models[0].bottomRight();
  QString text;
  for(int i=start.row(); i<=stop.row(); ++i) {
    for(int j=start.column(); j<=stop.column(); ++j) {
      if(model->item(i,j)->text() != "="){
        text+= model->item(i,j)->text();
        text += ' ';
      }
    }
    text += '\n';
  }
  QApplication::clipboard()->setText(text);
}

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Now, when i select an area and try copy, it copy random value, further only one left or right column, or top or bottom row. Function copyCells works well, i tested it earlier. Where I make error?