With the addition of IDE support, the widget previewer is often started by default by IDE plugins, even if users don't open the previewer. This means that we can't rely on the analytic event that reports the flutter widget-preview start command was run to determine daily active user counts as it doesn't capture whether or not developers have actually opened the previewer.

The widget previewer should report a separate event once the Flutter tool received the Connected event on the WidgetPreviewScaffold DTD stream.