If the main window has been minimized to the taskbar (iconified) calling "Show/Hide", "Send" or "Receive" actions from the tray icon menu has no effect: the main window still minimized.

It seems like a Qt bug similar to that old [one](https://bugreports.qt.io/browse/QTBUG-31117).

Tested platform: Linux Mint 19, Qt 5.9.5 / 5.9.6
{
    if (!clientModel || !clientModel->getOptionsModel())
        return;
    OptionsDialog dlg(this, enableWallet);
    dlg.setCurrentTab(tab);
    dlg.setModel(clientModel->getOptionsModel());
    dlg.exec();
}
void BitcoinGUI::setNumBlocks(int count, const QDateTime& blockDate, double nVerificationProgress, bool header)
{
#ifdef Q_OS_MAC
    (m_node.isInitialBlockDownload() || m_node.getReindex() || m_node.getImporting()) ? m_app_nap_inhibitor->disableAppNap() : m_app_nap_inhibitor->enableAppNap();
#endif
    if (modalOverlay)
    {
        if (header)
            modalOverlay->setKnownBestHeight(count, blockDate);
        else
            modalOverlay->tipUpdate(count, blockDate, nVerificationProgress);
    }
    if (!clientModel)
        return;
    
    statusBar()->clearMessage();
    
    enum BlockSource blockSource = clientModel->getBlockSource();