Noticed this while reviewing #13529, but it's also in master @ 5ba77df. On macOS 10.13.6:

<img width="209" alt="schermafbeelding 2018-08-01 om 16 22 09" src="https://user-images.githubusercontent.com/10217/43527498-0f571db4-95a7-11e8-8d90-7863947a7689.png">


<img width="178" alt="schermafbeelding 2018-08-01 om 16 12 51" src="https://user-images.githubusercontent.com/10217/43526994-c9a515ec-95a5-11e8-96b8-9e2513e9aac5.png">

* `Show` in the action menu doesn't work if the app was hidden by `Command + H`, it does work when hidden through this menu
* send and receive don't unhide the window when opened for the action menu. It does navigate to the right tab. The other actions do work (sign, verify & debug window)

Clicking "Toon" (= macOS native show) does work, suggesting the GUI uses some non-native method of hiding.
{
    
    openRPCConsoleAction->setEnabled(true);
    aboutAction->setEnabled(true);
    optionsAction->setEnabled(true);
}
#ifdef ENABLE_WALLET
void BitcoinGUI::incomingTransaction(const QString& date, int unit, const CAmount& amount, const QString& type, const QString& address, const QString& label, const QString& walletName)
{
    
    QString msg = tr("Date: %1\n").arg(date) +
                  tr("Amount: %1\n").arg(BitcoinUnits::formatWithUnit(unit, amount, true));
    if (m_node.getWallets().size() > 1 && !walletName.isEmpty()) {
        msg += tr("Wallet: %1\n").arg(walletName);
    }
    msg += tr("Type: %1\n").arg(type);
    if (!label.isEmpty())
        msg += tr("Label: %1\n").arg(label);
    else if (!address.isEmpty())
        msg += tr("Address: %1\n").arg(address);
    message((amount)<0 ? tr("Sent transaction") : tr("Incoming transaction"),
             msg, CClientUIInterface::MSG_INFORMATION);
}
#endif 
void BitcoinGUI::dragEnterEvent(QDragEnterEvent *event)