If the main window has been minimized to the taskbar (iconified) calling "Show/Hide", "Send" or "Receive" actions from the tray icon menu has no effect: the main window still minimized.

It seems like a Qt bug similar to that old [one](https://bugreports.qt.io/browse/QTBUG-31117).

Tested platform: Linux Mint 19, Qt 5.9.5 / 5.9.6
@param[in] hdEnabled         current hd enabled status
     @see WalletModel::EncryptionStatus
     */
    void setHDStatus(int hdEnabled);
public Q_SLOTS:
    bool handlePaymentRequest(const SendCoinsRecipient& recipient);
    
    void incomingTransaction(const QString& date, int unit, const CAmount& amount, const QString& type, const QString& address, const QString& label, const QString& walletName);
#endif 
private:
    
    void updateProxyIcon();
public Q_SLOTS:
#ifdef ENABLE_WALLET
    
    void gotoOverviewPage();
    
    void gotoHistoryPage();
    
    void gotoReceiveCoinsPage();
    
    void gotoSendCoinsPage(QString addr = "");
    
    void gotoSignMessageTab(QString addr = "");
    
    void gotoVerifyMessageTab(QString addr = "");
    
    void openClicked();
#endif