Bug: onfocus is not called when focused in an action

[abdel-17]

Describe the bug

The onfocus handler is not called when the focus action focuses the input.

<script lang="ts">
	let attributes = {};

	const focus = (input) => {
		input.focus();
	};
</script>

<input
	{...attributes}
	onfocus={() => console.log("onfocus", "1")}
	use:focus
/>

If you remove the object spread, it mysteriously starts working again.

<script lang="ts">
	const focus = (input) => {
		input.focus();
	};
</script>

<input
	onfocus={() => console.log("onfocus", "1")}
	use:focus
/>

Reproduction

https://svelte.dev/playground/hello-world?version=5.2.7#H4sIAAAAAAAAE42QwWrDMBBEf0Vse7DB2CRH1zL01n-oenDsdStQV8ZaJy1C_14kOZRAoL2JN7szs_JAwydCCy9ojBUXu5pJFDhpxqmECmZt0EH76oG_lzgXAVTXredlqd0ZDUd2Ghze46MlRmIHLXRuXPXCwgz0LhWwU9ArUmyQxcC86tPG6IQUPjwpispoybGY7bhFXGhaNi6F7IWPquIE6qQXZdzh62b0dB_2QkKKR8cDY6HgoCBOdU0uEsOpm_Q5tegcGhxZnDRN7XkwG0qfHEKfwzq7sLbUH7pmf93y4w3vmuzXx7w9g_yDnq-1pBSpUUjT6ZLs5-u6_v2OkKGldKX0Rbo_fow1WBv7XijYRQVVtiz3pc1hmxVS3PSKfKPncLfI8U6R_2ce_8qEChi_GFpeNwxv4QcTXTJoegIAAA==

Logs

No response

System Info

Not needed

Severity

annoyance

[paoloricciuti]

I was looking into this and i guess the problem is here: when using set_attributes all events are on the next microtask to allow for the bindings event to take precedence. This means the focus event is added after the action called focus.

svelte/packages/svelte/src/internal/client/dom/elements/attributes.js

Lines 328 to 339 in 6e391fc

	// On the first run, ensure that events are added after bindings so
	// that their listeners fire after the binding listeners
	if (!prev) {
	queue_micro_task(() => {
	if (!element.isConnected) return;
	for (const [key, value, evt] of events) {
	if (current[key] === value) {
	evt();
	}
	}
	});
	}