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 false;
    const QString name = walletModel->getWalletName();
    QString display_name = name.isEmpty() ? "["+tr("default wallet")+"]" : name;
    setWalletActionsEnabled(true);
    m_wallet_selector->addItem(display_name, name);
    if (m_wallet_selector->count() == 2) {
        m_wallet_selector_label_action->setVisible(true);
        m_wallet_selector_action->setVisible(true);
    }
    rpcConsole->addWallet(walletModel);
    return walletFrame->addWallet(walletModel);
}
bool BitcoinGUI::removeWallet(WalletModel* walletModel)
{
    if (!walletFrame) return false;
    QString name = walletModel->getWalletName();
    int index = m_wallet_selector->findData(name);
    m_wallet_selector->removeItem(index);
    if (m_wallet_selector->count() == 0) {
        setWalletActionsEnabled(false);
    } else if (m_wallet_selector->count() == 1) {
        m_wallet_selector_label_action->setVisible(false);
        m_wallet_selector_action->setVisible(false);
    }
    rpcConsole->removeWallet(walletModel);
    return walletFrame->removeWallet(name);
}
bool BitcoinGUI::setCurrentWallet(const QString& name)