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 (!walletFrame) {
        return;
    }
    WalletView * const walletView = walletFrame->currentWalletView();
    if (!walletView) {
        return;
    }
    WalletModel * const walletModel = walletView->getWalletModel();
    setEncryptionStatus(walletModel->getEncryptionStatus());
    setHDStatus(walletModel->wallet().hdEnabled());
}
#endif 
void BitcoinGUI::updateProxyIcon()
{
    std::string ip_port;
    bool proxy_enabled = clientModel->getProxyInfo(ip_port);
    if (proxy_enabled) {
        if (labelProxyIcon->pixmap() == 0) {
            QString ip_port_q = QString::fromStdString(ip_port);
            labelProxyIcon->setPixmap(platformStyle->SingleColorIcon(":/icons/proxy").pixmap(STATUSBAR_ICONSIZE, STATUSBAR_ICONSIZE));
            labelProxyIcon->setToolTip(tr("Proxy is <b>enabled</b>: %1").arg(ip_port_q));
        } else {
            labelProxyIcon->show();
        }
    } else {
        labelProxyIcon->hide();
    }
}
void BitcoinGUI::showNormalIfMinimized(bool fToggleHidden)