fix: call all event handlers even if an exception occurs in one

[adiguba]

Error in Svelte event dispatcher is inconsistant with the browser event handling.

I think that Svelte should mimic the browser event handling : if an error occurs on an event-handler, it should be stopped, but it should not impact the others event-handlers.

Fixes #8403

Note that I try to write an unit-test, but it fails because of the exception on the handler, and I don't know how to ignore that.

Before submitting the PR, please make sure you do the following

• It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
• Prefix your PR title with feat:, fix:, chore:, or docs:.
• This message body should clearly illustrate what problems it solves.
• Ideally, include a test that fails without this PR but passes with it.

Tests

• Run the tests with npm test and lint the project with npm run lint

[vercel]

@adiguba is attempting to deploy a commit to the Svelte Team on Vercel.

A member of the Team first needs to authorize it.

[benmccann]

question for more knowledgeable reviewers: will this file be called during ssr? if so, we probably need to fix this reference to window. also note that reportError is not yet supported in Node

[adiguba]

Oh I miss that component events can be triggered in SSR !
Don't know how to handle this correctly...

[Rich-Harris]

Closing as we're no longer adding stuff to Svelte 4, but updated #8403 for Svelte 5