shouldComponentUpdate returns true when the item is visible

Nobody has claimed this yet.

Hey there!
Im trying to understand whats the reason for the shouldcomponentupdate logic that you are applying.
```
shouldComponentUpdate(_nextProps, nextState) {
return nextState.visible;
}
```

If the current state is visible and the next one is also visible then why should i update the component?
i would think that the wanted behavior should be:

```
shouldComponentUpdate(_nextProps, nextState) {
return !this.state.visible && nextState.visible;
}
```
What am i missing here?
Thanks!

Start at the component's shouldComponentUpdate implementation and trace how visible changes as items enter the viewport. Compare the current and next state behavior, then inspect any existing component tests to determine the expected update semantics; no test path is named in the issue.

Written by the indexing model from the issue text.