[BeckyEbook]

I have quick and dirty solution (you can certainly optimise this):

bool FindReplace::HasFocus2()
{
    return ui.cbReplace->lineEdit()->hasFocus();
}

...

void FindReplace::SetCodeViewIfNeeded()
{
    bool has_focus = HasFocus();
    if (has_focus) {
        // give the current tab CodeView Tab the focus
        ui.cbFind->lineEdit()->clearFocus();
        ui.cbReplace->lineEdit()->clearFocus();
        ContentTab * current_tab = m_MainWindow->GetCurrentContentTab();
        if (current_tab) current_tab->setFocus();
    }

    bool has_focus2 = HasFocus2();
    if (has_focus2) {
        // give the current tab CodeView Tab the focus
        ui.cbReplace->lineEdit()->clearFocus();
        ContentTab * current_tab = m_MainWindow->GetCurrentContentTab();
        if (current_tab) current_tab->setFocus();
    }
}