Andrew Scott
53ca936366
This exposes a new function from the router public API that allows developers to create a `UrlTree` from _any_ `ActivatedRouteSnapshot`. The current Router APIs only support creating a `UrlTree` from an `ActivatedRoute` which is both active _and_ materially appears in the `UrlTree` (it cannot be an empty path named outlet). This is because the implementation of the current way of creating a `UrlTree` attempts to look up the `UrlSegment` of the `ActivatedRoute` in the currently active `UrlTree` of the router. When this doesn't work, the `UrlTree` creation fails. Note that this API does not replace the current one. That would actually be a breaking change but should be done at some point in the future (v15). That is, `router.navigate` should call this new function. At that point, we can remove `_lastPathIndex`, `_urlSegment`, and `_correctedPathIndex` from the `ActivatedRoute`, along with all of the logic associated with determining what those should be. In addition, this would unblock a fix for #26081 because the `applyRedirects` and `recognize` operations could be combined into one. Overall, this would simplify logic in the router and reduce code size. It also exposes core routing capabilities as a helper function which were previously private API, which is a necessary step towards #42953. As a stress test for this new function, it _was_ swapped in as the default for `UrlTree` creation in #45859 and tested internally. The results indicate that this function behaves correctly. resolves #42191 (Tested directly) resolves #38276 (The test with a guard covers this case) resolves #22763 (Tested directly) PR Close #45877
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