Incorrect undo on multiple instances

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Hi there,

thank you for a great Svelte-ready component. I am testing out currently and using 2 editor instances on the same page. It works well generally but the undo function has a problem:

• make some changes in instance # 1
• make some changes in instance # 2
• click the Undo button on instance # 1

Undo works as expected on instance # 1, the problem is that it also undo the changes on instance # 2!

Looks like either the undo stack is shared between instances, or the undo event is passed to both instances.

Best regards