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Andrew Scott
b9aab0c87b
This code mimics behavior that Google Analytics has been using to prevent duplicate navigations. They set up their own `HybridRoutingService` location sync to avoid duplicate navigations that came from the Angular router. This would happen because the Angular router would trigger a navigation, which would then get picked up by the `$locationShim`, which would trigger a `$locationChangeStart`, which would then be picked up by the `setUpLocationSync` watcher here, which would again trigger a navigation in the Angular Router. All of this can be prevented by checking if the `navigationId` exists on the history state object. This property is added by the Angular router during navigations. fixes #21610 PR Close #43441