e9a19a6152
Fix router to ensure that a route module is only loaded once especially in relation to the use of preload strategies with delayed or partial loading. Add test to check the interaction of PreloadingStrategy and normal router navigation under differing scenarios. Checking: * Prevention of duplicate loading of modules. related to #26557 * Prevention of duplicate RouteConfigLoad(Start|End) events related to #22842 * Ensuring preload strategy remains active for submodules if needed The selected preload strategy should still decide when to load submodules * Possibility of memory leak with unfinished preload subscription related to #26557 * Ensure that the stored loader promise is cleared so that subsequent load will try the fetch again. * Add error handle error from loadChildren * Ensure we handle error from with NgModule create Fixes #26557 #22842 #26557 PR Close #40389
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