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.
{
    this->walletModel = _walletModel;
    
    transactionView->setModel(_walletModel);
    overviewPage->setWalletModel(_walletModel);
    receiveCoinsPage->setModel(_walletModel);
    sendCoinsPage->setModel(_walletModel);
    usedReceivingAddressesPage->setModel(_walletModel ? _walletModel->getAddressTableModel() : nullptr);
    usedSendingAddressesPage->setModel(_walletModel ? _walletModel->getAddressTableModel() : nullptr);
    if (_walletModel)
    {
        
        connect(_walletModel, &WalletModel::message, this, &WalletView::message);
        
        connect(_walletModel, &WalletModel::encryptionStatusChanged, this, &WalletView::encryptionStatusChanged);
        updateEncryptionStatus();
        
        Q_EMIT hdEnabledStatusChanged();
        
        connect(_walletModel->getTransactionTableModel(), &TransactionTableModel::rowsInserted, this, &WalletView::processNewTransaction);
        
        connect(_walletModel, &WalletModel::requireUnlock, this, &WalletView::unlockWallet);
        
        connect(_walletModel, &WalletModel::showProgress, this, &WalletView::showProgress);
    }
}
void WalletView::processNewTransaction(const QModelIndex& parent, int start, int )