Check why we no longer bail out of subscription checks when store.getState() hasn't changed

[markerikson]

In v7, we definitely bailed out of useSelector if the store state hadn't changed:

react-redux/src/hooks/useSelector.js

Lines 67 to 71 in 49f7680

	const newStoreState = store.getState()
	// Avoid calling selector multiple times if the store's state has not changed
	if (newStoreState === latestStoreState.current) {
	return
	}

Per reduxjs/redux#4627 , there's questions of whether it still does that correctly in v8 with useSyncExternalStore. Should look into this.

(also, there's a question of whether we should bail out inside subscriber callbacks, or before calling them)

[gentlee]

Hey @markerikson, I fixed it in react.