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- Remove JQuery - Remove legacy `document.webkitHidden` support. None of our currently supported browsers need this - Use `passive` event listeners. These allows the browser to process the events first, before passing control to us - Add a new `unseenTime` parameter. This allows consumers to request a delay before being notified about the browser going into the background - Add a method for removing a callback - Fire the callback when presence changes in either direction. Previously it would only fire when the user becomes present after a period of inactivity. - Ensure callbacks are only called once for each state change. Previously they would be called every 60s, regardless of the value - Listen to the `visibilitychanged` and `focus` events, treating them as equivalent to user action. This will make messagebus re-activate more quickly when switching back to a stale tab - Add test helpers - Delete the unused `discourse/lib/page-visible` module. - Call message-bus's onVisibilityChange API directly, rather than dispatching a fake event on the `document`