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fix(animations): cleanup DOM elements when the root view is removed
Currently, when importing `BrowserAnimationsModule`, Angular uses `AnimationRenderer` as the renderer. When the root view is removed, the `AnimationRenderer` defers the actual work to the `TransitionAnimationEngine` to do this, and the `TransitionAnimationEngine` doesn't actually remove the DOM node, but just calls `markElementAsRemoved()`. The actual DOM node is not removed until `TransitionAnimationEngine` "flushes". Unfortunately, though, that "flush" will never happen, since the root view is being destroyed and there will be no more flushes. This commit adds `flush()` call when the root view is being destroyed. BREAKING CHANGE: DOM elements are now correctly removed when the root view is removed. It is possible that tests could be accidentally relying on the old behavior by trying to find an element that was not removed in a previous test. If this is the case, the failing tests should be updated to ensure they have proper setup code which initializes elements they rely on.
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