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 (event->type() == QEvent::StatusTip)
    {
        
        if (progressBarLabel->isVisible() || progressBar->isVisible())
            return true;
    }
    return QMainWindow::eventFilter(object, event);
}
#ifdef ENABLE_WALLET
bool BitcoinGUI::handlePaymentRequest(const SendCoinsRecipient& recipient)
{
    
    if (walletFrame && walletFrame->handlePaymentRequest(recipient))
    {
        showNormalIfMinimized();
        gotoSendCoinsPage();
        return true;
    }
    return false;
}
void BitcoinGUI::setHDStatus(int hdEnabled)
{
    labelWalletHDStatusIcon->setPixmap(platformStyle->SingleColorIcon(hdEnabled ? ":/icons/hd_enabled" : ":/icons/hd_disabled").pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
    labelWalletHDStatusIcon->setToolTip(hdEnabled ? tr("HD key generation is <b>enabled</b>") : tr("HD key generation is <b>disabled</b>"));
    
    labelWalletHDStatusIcon->setEnabled(hdEnabled);
}
void BitcoinGUI::setEncryptionStatus(int status)