[bug] Paraglide Adapter SvelteKit doesn't work with Svelte 5

[LorisSigrist]

Problem

From Discord:

The problem is: right after clicking on the language selector anchor, the URL is updated correctly, but not the translation text, then after changing it once again it applies the old language.
Ex.
pnpm run dev -> EN (default) -> Click the "ES" selector -> ES (with English text) -> Click the "EN" selector -> EN (with Spanish text)

Expected behavior

No response

Reproduction

Our Example, but with Svelte 5 instead of Svelte 4

Other information

No response

[LorisSigrist]

I identified the issue.
Svelte 5 (unintentionally) changed the behaviour of the {#key} block & moved it in the update order. This caused the language-rerenders to happen before the language state was properly updated.

Will be fixed in the next release!

[LorisSigrist]

I opened an issue on the svelte repo, since Svelte 5 is supposed to be backwards compatible:

sveltejs/svelte#10597