ScreenViewMixpanelEventTrackerFactory
class ScreenViewMixpanelEventTrackerFactory(mixpanel: MixpanelAPI) : MixpanelEventTrackerFactory(source)
Claims every ScreenViewEvent and declines everything else, which is GenericMixpanelEventTrackerFactory's business.
A screen view does not go through the generic path because it is sent under one shared screen_view name with the screen as a screen_name property, so all screens land in a single Mixpanel event that can be broken down by screen.
To handle screen views differently, write a factory and place it before this one in the chain.