frontend-collective / frontend-collective/react-sortable-tree

Constant Re-rendering when isVirtualized is `true`

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Description

It appears that when virtualization is being used, the component is constantly re-rendering.

I am seeing this both in my own application and in [the demo for this project](https://frontend-collective.github.io/react-sortable-tree/):
![Constant Re-render](https://user-images.githubusercontent.com/2631799/67320717-96b5f380-f4dc-11e9-9837-60a189891f2d.gif)

In my application, if I set `isVirtualized` to `false`, constant re-rendering does not occur. My application is using version 2.6.2.

## Environment
- Windows 10.0.18362 Build 18362
- Chrome 77.0.3865.120 (Official Build) (64-bit)

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