gnome-shell-extension-appindicator 29-1~ubuntu19.04.1 (amd64 binary) in ubuntu disco

 This extension integrates Ubuntu AppIndicators and KStatusNotifierItems
 (KDE's blessed successor of the systray) into GNOME Shell.
 .
 Features:
 .
  - show indicator icons in the panel
  - reveal indicator menus upon click
  - double clicking an icon will activate the application window
    (if implemented by the indicator)
  - middle mouse click an icon to send a 'SecondaryActivate' event
    to the application. Support needs to be implemented in the application