A demo application using Unity's global menu bar
Make more details available in the error message when failing to start calibre because another instance is running
Handle checkable actions and make event processing async
Implement the AboutToShow callbacks
Add a submenu to the demo
Refactor StatusNotifierItem to uses the global DBus export factory
Add system tray to demo app
Fix system tray icons not working in Ubuntu
...
Buttons to add/remove menus from the menubar in the demo
Merge remote-tracking branch 'upstream/master'
Revert "Tweak to allow minimum size for proceed popup"

This reverts commit 38eaaa11e673dca5aa959246e8999fc605dd7297.