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Replaces the current method of setting a loading indicator, with a newer mechanism that doesn't suffer from the problem that it turns widgets into containers.
This change does mean that you can't query for the loading indicator. I don't think anyone will care. It's more of a problem to accidentally query it. If someone complains, we can add an accessor of some kind.
As an aside, it wasn't too hard to add this mechanism where things can be rendered but aren't in the DOM. We may want to do this for tooltips and notifications.
Fixes #3935