Svelte demo broken

[mmailaender]

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Describe the issue https://codesandbox.io/s/revogrid-svelte-latest-7g7vo8?file=/Grid.svelte

To Reproduce

Open https://codesandbox.io/s/revogrid-svelte-latest-7g7vo8?file=/Grid.svelte or https://revolist.github.io/revogrid/demo/svelte.sample.html