bugfix(svelte): fix colliding id's generated from $props.id

[Hugos68]

Closes #13327

Utilizes the new idPrefix option from server/client side rendering added in sveltejs/svelte#15403 in Svelte to inject a unique prefix generated by Astro.

Changes

• Enables different Svelte islands to generate non colliding $props.id

Testing

No tests were added because it looks like the Svelte integration isn't tested, at all?

Docs

This would only solve problems, it's highly unlikely a user depended on colliding ID's for their app to work. It's also a very niche use case using two client side Astro Svelte components with $props.id

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[florian-lefebvre]

@Hugos68 ping me when the related svelte PR is merged and released

[Hugos68]

@florian-lefebvre Merged and released in: sveltejs/svelte#15428. API is available in version 5.22.0!

[Hugos68]

I'll aim to update my PR and will request a review after.

[Hugos68]

@florian-lefebvre I've implemented the prefix for the server side part of islands. I don't know how to apply it to the client, some help would be much appreciated.

[florian-lefebvre]

I'll look into it later today!

[florian-lefebvre]

Looking at sveltejs/svelte#15428, I think svelte takes care of ids on the client

[Hugos68]

incrementId came from context, but I see you've added the missing import and file. Like I said, I was a bit puzzled so ended up reverting a bunch of stuff but didn't that correctly.

[Hugos68]

Looking at sveltejs/svelte#15428, I think svelte takes care of ids on the client

Ok, sounds good, so then if the server side prefixing looks correct I'll move it to a ready for review PR.

[florian-lefebvre]

Thanks for the help and the contribution upstream!

[Hugos68]

Yeah I think I borked something when merging upstream changes back to this branch, thanks for picking these up.