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.
{
        Q_OBJECT
    Q_SIGNALS:
        /** Emitted when the progressbar is clicked. The relative mouse coordinates of the click are
         * passed to the signal.
         */
        void clicked(const QPoint& point);
    protected:
        void mouseReleaseEvent(QMouseEvent *event);
    };
    typedef ClickableProgressBar ProgressBar;
    class ItemDelegate : public QItemDelegate
    {
        Q_OBJECT
    public:
        ItemDelegate(QObject* parent) : QItemDelegate(parent) {}
    Q_SIGNALS:
        void keyEscapePressed();
    private:
        bool eventFilter(QObject *object, QEvent *event);
    };
} 
#endif