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.
{
}
void WalletView::setBitcoinGUI(BitcoinGUI *gui)
{
    if (gui)
    {
        
        connect(overviewPage, &OverviewPage::transactionClicked, gui, &BitcoinGUI::gotoHistoryPage);
        
        connect(sendCoinsPage, &SendCoinsDialog::coinsSent, gui, &BitcoinGUI::gotoHistoryPage);
        
        connect(this, &WalletView::message, [gui](const QString &title, const QString &message, unsigned int style) {
            gui->message(title, message, style);
        });
        
        connect(this, &WalletView::encryptionStatusChanged, gui, &BitcoinGUI::updateWalletStatus);
        
        connect(this, &WalletView::incomingTransaction, gui, &BitcoinGUI::incomingTransaction);
        
        connect(this, &WalletView::hdEnabledStatusChanged, gui, &BitcoinGUI::updateWalletStatus);
    }
}
void WalletView::setClientModel(ClientModel *_clientModel)
{
    this->clientModel = _clientModel;
    overviewPage->setClientModel(_clientModel);
    sendCoinsPage->setClientModel(_clientModel);
}
void WalletView::setWalletModel(WalletModel *_walletModel)