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
*/
    bool addWallet(WalletModel *walletModel);
    bool removeWallet(WalletModel* walletModel);
    void removeAllWallets();
#endif 
    bool enableWallet = false;
protected:
    void changeEvent(QEvent *e);
    void closeEvent(QCloseEvent *event);
    void showEvent(QShowEvent *event);
    void dragEnterEvent(QDragEnterEvent *event);
    void dropEvent(QDropEvent *event);
    bool eventFilter(QObject *object, QEvent *event);
private:
    interfaces::Node& m_node;
    std::unique_ptr<interfaces::Handler> m_handler_message_box;
    std::unique_ptr<interfaces::Handler> m_handler_question;
    ClientModel* clientModel = nullptr;
    WalletFrame* walletFrame = nullptr;
    UnitDisplayStatusBarControl* unitDisplayControl = nullptr;
    QLabel* labelWalletEncryptionIcon = nullptr;
    QLabel* labelWalletHDStatusIcon = nullptr;
    GUIUtil::ClickableLabel* labelProxyIcon = nullptr;
    GUIUtil::ClickableLabel* connectionsControl = nullptr;
    GUIUtil::ClickableLabel* labelBlocksIcon = nullptr;
    QLabel* progressBarLabel = nullptr;
    GUIUtil::ClickableProgressBar* progressBar = nullptr;
    QProgressDialog* progressDialog = nullptr;
    QMenuBar* appMenuBar = nullptr;
    QToolBar* appToolBar = nullptr;