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Stacked on #33160. By default, if `onDefaultTransitionIndicator` is not overridden, this will trigger a fake Navigation event using the Navigation API. This is intercepted to create an on-going navigation until we complete the Transition. Basically each default Transition is simulated as a Navigation. This triggers the native browser loading state (in Chrome at least). So now by default the browser spinner spins during a Transition if no other loading state is provided. Firefox and Safari hasn't shipped Navigation API yet and even in the flag Safari has, it doesn't actually trigger the native loading state. To ensures that you can still use other Navigations concurrently, we don't start our fake Navigation if there's one on-going already. Similarly if our fake Navigation gets interrupted by another. We wait for on-going ones to finish and then start a new fake one if we're supposed to be still pending. There might be other routers on the page that might listen to intercept Navigation Events. Typically you'd expect them not to trigger a refetch when navigating to the same state. However, if they want to detect this we provide the `"react-transition"` string in the `info` field for this purpose. |
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