chore: demo input issues

[Jaryt]

Here are the examples for issues with inputs when traversing portals. Hope this helps with tracking down how to solve event propagation! :)

apologies for my formatting lol

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[pimterry]

I'm going to close this since we won't want to actually merge it as-is, but the examples are super helpful and this is definitely going to be useful to test the behaviour of fixes for #47 in future. Thanks @Jaryt!

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