• don't delegate events on custom elements
• still invoke listener for cancelled event on the element where it was cancelled: when you dostopPropagation,event.cancelBubble becomestrue. We can't use this as an indicator to not invoke a listener directly, because the listner could be on the element where propagation was cancelled, i.e. it should still run for that listener. Instead, adjust the event propagation algorithm to detect when a delegated event listener caused the event to be cancelled

fixes#14704

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 withfeat:,fix:,chore:, ordocs:.
• This message body should clearly illustrate what problems it solves.
• Ideally, include a test that fails without this PR but passes with it.
• If this PR changes code withinpackages/svelte/src, add a changeset (npx changeset).

Tests and linting

• Run the tests withpnpm test and lint the project withpnpm lint