Deselect lines in table views

[Lykurg]

Use signal and slots. Try something like that:

QTableWidget w1;
    w1.setRowCount(5);
    w1.setColumnCount(3);
 
    QTableWidget w2;
    w2.setRowCount(5);
    w2.setColumnCount(3);
 
    for(int row = 0; row < 5; ++row)
    {
        for(int column = 0; column < 3; ++column)
        {
            QTableWidgetItem *newItem = new QTableWidgetItem(QString("%1").arg((row+1)*(column+1)));
            w1.setItem(row, column, newItem);
        }
    }
 
    for(int row = 0; row < 5; ++row)
    {
        for(int column = 0; column < 3; ++column)
        {
            QTableWidgetItem *newItem = new QTableWidgetItem(QString("%1").arg((row+1)*(column+1)));
            w2.setItem(row, column, newItem);
        }
    }
 
    QWidget w;
    QHBoxLayout l;
    l.addWidget(&w1);
    l.addWidget(&w2);
    w.setLayout(&l);
    w.show();
 
    QObject::connect(&w1, SIGNAL(currentItemChanged(QTableWidgetItem*,QTableWidgetItem*)), &w2, SLOT(clearSelection()));

QTableWidget w1;
    w1.setRowCount(5);
    w1.setColumnCount(3);

    QTableWidget w2;
    w2.setRowCount(5);
    w2.setColumnCount(3);

    for(int row = 0; row < 5; ++row)
    {
        for(int column = 0; column < 3; ++column)
        {
            QTableWidgetItem *newItem = new QTableWidgetItem(QString("%1").arg((row+1)*(column+1)));
            w1.setItem(row, column, newItem);
        }
    }

    for(int row = 0; row < 5; ++row)
    {
        for(int column = 0; column < 3; ++column)
        {
            QTableWidgetItem *newItem = new QTableWidgetItem(QString("%1").arg((row+1)*(column+1)));
            w2.setItem(row, column, newItem);
        }
    }

    QWidget w;
    QHBoxLayout l;
    l.addWidget(&w1);
    l.addWidget(&w2);
    w.setLayout(&l);
    w.show();

    QObject::connect(&w1, SIGNAL(currentItemChanged(QTableWidgetItem*,QTableWidgetItem*)), &w2, SLOT(clearSelection()));

To copy to clipboard, switch view to plain text mode 

But be aware that this is just a demonstration. You have to make a own slot, from where you clear the table widgets and make sure that you don't get a infinite loop. To know which table widget calls the slot use QTableWidgetItem::tableWidget().