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.
{
    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)