message: qt: Prevent the main window popup menu
  By default, a popup menu contains checkable entries for the toolbars
  and dock widgets present in the main window. This allows users to
  accidentally hide the toolbar.
diff: @@ -98,6 +98,8 @@ BitcoinGUI::BitcoinGUI(interfaces::Node& node, const PlatformStyle *_platformSty
  move(QGuiApplication::primaryScreen()->availableGeometry().center() - frameGeometry().center());
  }
  + setContextMenuPolicy(Qt::PreventContextMenu);
  +
  #ifdef ENABLE_WALLET
  enableWallet = WalletModel::isWalletEnabled();
  #endif // ENABLE_WALLET
  @@ -632,7 +634,6 @@ void BitcoinGUI::createToolBars()
  toolbar->setMovable(false);
  toolbar->setToolButtonStyle(Qt::ToolButtonTextOnly);
  toolbar->addWidget(imageLogo);
  - toolbar->setContextMenuPolicy(Qt::PreventContextMenu);
  toolbar->setMovable(false);
  toolbar->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
  toolbar->addAction(overviewAction);
  