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.
{
    QStringList strList;
    
    for (int i = 0; i < 8; i++) {
        uint64_t check = 1 << i;
        if (mask & check)
        {
            switch (check)
            {
            case NODE_NETWORK:
                strList.append("NETWORK");
                break;
            case NODE_GETUTXO:
                strList.append("GETUTXO");
                break;
            case NODE_BLOOM:
                strList.append("BLOOM");
                break;
            case NODE_WITNESS:
                strList.append("WITNESS");
                break;
            case NODE_XTHIN:
                strList.append("XTHIN");
                break;
            default:
                strList.append(QString("%1[%2]").arg("UNKNOWN").arg(check));
            }
        }
    }