Allow for auto-reload or an event on frontend updates

[rccoleman]

Currently, the frontend displays a persistent "toast" message at the bottom when there's a change to the frontend and it needs to be reloaded. It's not automatic because the user may be interacting with the device at the time, and then user can hit the "reload" button in the toast when it's convenient. This is not a great experience for always-on tablets that are displaying the frontend, and requires manual intervention on each tablet to dismiss the toast message and get the frontend to refresh.

It would be helpful if we could either designate a device as "unattended" or "always on" and have it automatically refresh when needed, or at least emit an event that can be used as a trigger in an automation that refreshes the tablets (through a service call to Fully Kiosk, for instance). I don't think such an event exists, but do let me know if it already does.

[rccoleman]

I was pointed to the lovelace_updated event as a trigger for when the dashboard updates, and it seems to be what I'm looking for. I see it being fired in homeassistant/components/lovelace, and I've added it to my automation that refreshes the tablets. I couldn't find it documented anywhere, but I do see references to it on the forum.