Re: [whatwg/dom] Shadow: Specify when `slotchange` fires (#447)

I forgot to add, `slotchange` events could be used, for example, to properly connect or disconnect Three.js `THREE.Object3D` instances from each other if those, for example, were used to render `<monster-character>`. Simply relying on `parentNode` or watching `children` with `MutationObserver` won't work, the scene won't be rendered correctly unless we consider the composed tree.

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