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
QAction* overviewAction = nullptr;
    QAction* historyAction = nullptr;
    QAction* quitAction = nullptr;
    QAction* sendCoinsAction = nullptr;
    QAction* sendCoinsMenuAction = nullptr;
    QAction* usedSendingAddressesAction = nullptr;
    QAction* usedReceivingAddressesAction = nullptr;
    QAction* signMessageAction = nullptr;
    QAction* verifyMessageAction = nullptr;
    QAction* aboutAction = nullptr;
    QAction* receiveCoinsAction = nullptr;
    QAction* receiveCoinsMenuAction = nullptr;
    QAction* optionsAction = nullptr;
    QAction* toggleHideAction = nullptr;
    QAction* encryptWalletAction = nullptr;
    QAction* backupWalletAction = nullptr;
    QAction* changePassphraseAction = nullptr;
    QAction* aboutQtAction = nullptr;
    QAction* openRPCConsoleAction = nullptr;
    QAction* openAction = nullptr;
    QAction* showHelpMessageAction = nullptr;
    QAction* m_wallet_selector_label_action = nullptr;
    QAction* m_wallet_selector_action = nullptr;
    QLabel *m_wallet_selector_label = nullptr;
    QComboBox* m_wallet_selector = nullptr;
    QSystemTrayIcon* trayIcon = nullptr;
    QMenu* trayIconMenu = nullptr;
    Notificator* notificator = nullptr;
    RPCConsole* rpcConsole = nullptr;
    HelpMessageDialog* helpMessageDialog = nullptr;