#include <QtTest>
#include <QtDebug>
#include <QComboBox>
#include <QLineEdit>
#include <QGridLayout>

class MyClass : public QWidget
{
    Q_OBJECT
public:
    MyClass(QWidget * parent = 0)
        : QWidget(parent), pos(-1), comboBox(NULL)
    {
        comboBox = new QComboBox(this);
        comboBox->addItems(QStringList() << "test" << "string" << "qwerty");
        comboBox->setEditable(true);

        QGridLayout * layout = new QGridLayout(this);
        layout->addWidget(comboBox);

        connect(comboBox->lineEdit(), SIGNAL(textEdited(QString)), this, SLOT(OnEditTextChanged(QString)));
        // если закоментировать этот коннект, выделение сохранится
        connect(comboBox->lineEdit(), SIGNAL(selectionChanged()), this, SLOT(deselect()));
    }

    QComboBox * getComboBox() const
    {
        return comboBox;
    }

public slots:
    void OnEditTextChanged(const QString& strText)
    {
        if (!comboBox) return;
        pos = comboBox->lineEdit()->cursorPosition();
        comboBox->setItemText(comboBox->currentIndex(), strText);
        comboBox->lineEdit()->setCursorPosition(pos);
    }

    void deselect()
    {
        if(comboBox && pos!=-1) {
            comboBox->lineEdit()->deselect();
            pos = -1;
        }
    }

private:
    int pos;
    QComboBox * comboBox;
};


class Test_MyClass : public QObject
{
    Q_OBJECT
private slots:
    void testSelectText()
    {
        MyClass * test = new MyClass;
        test->resize(250,35);
        test->show();

        QTest::qWait(3000);
        QCoreApplication::processEvents();

        QComboBox * box = test->getComboBox();

        // хм... А вот здесь происходит выделение текста в lineEdit'e comboBox'a
        box->lineEdit()->setCursorPosition(1);
        QTest::keyClicks(box->lineEdit(), "e");
        QCOMPARE(box->lineEdit()->selectionStart(), -1);

        QTest::qWait(5000);
    }
};

QTEST_MAIN(Test_MyClass)
#include <main_test.moc>

TEMPLATE = app
CONFIG  += teambuilder qtestlib warn_on debug create_prl link_prl
SOURCES += main_test.cpp