ScrollToIndex not scrolling as expected

I’ve created a small repro based on what we’re experiencing trying to make use of <List />'s scrollToIndex prop. I believe it’s a bug, given how simple the repro is and how closely we’ve attempted to follow documentation / examples, but it’s always possible we’ve just mixed something up.

What is the current behavior?

1. Clone the repro here
2. Build and start the app (I’ve been using recent version of Chrome)
3. Enter a number between 0 and 999 in the number input at the top of the screen

Despite the scrollToIndex state in <App /> being updated, which feeds down to the <List />'s scrollToIndex prop, the list is not navigated to the desired list element as expected.

What is the expected behavior?

The element at the index given in the number input box is navigated to.

Which versions of React and react-virtualized, and which browser / OS are affected by this issue? Did this work in previous versions of react-virtualized?

Browser	Chrome v69.0.3497.100
OS	Windows 10
React	16.5.2
React DOM	16.5.2
react-virtualized	9.20.1

[Uneedcode]

I have the same bug. so bad

[KaySackey]

I’m using this currently as a workaround. It’s pseudo-code that I extracted from a much larger file, but it’s a start on a workable solution.

    componentDidMount(){
        if (this.props.start_index < 0) {
            return;
        }

        const initial_top = this._list_ref.getOffsetForRow({
            alignment: "start",
            index: this.props.start_index,
        });
        
        window.scrollTo(0, initial_top);
    }
    
    render(){
        return (
            <List ref={ref => this._list_ref = ref} {...other_props} scrollToIndex={this.props.start_index}/>
        )
    }

Basically it manually calls getOffsetForRow after mounting, then scrolls the window the correct location. The scrollToIndex prop is still required, or else the List component will not render the correct rows initially.

I have been using this with WindowScroller, so I have no idea if it works solo as WindowScroller does things like patch the scrollTop.