Component update code generated unnecessarily

[Rich-Harris]

Describe the bug

A component with no props that could change will nevertheless get update code generated

To Reproduce

https://svelte.dev/repl/f26f7150be604723a047981635d30d0e?version=3.9.2

Expected behavior

	return {
		c() {
			foo.$$.fragment.c();
		},

		m(target, anchor) {
			mount_component(foo, target, anchor);
			current = true;
		},

-		p(changed, ctx) {
-			var foo_changes = {};
-			if (changed.y) foo_changes.x = y;
-			foo.$set(foo_changes);
-		},
+		noop,

		i(local) {
			if (current) return;
			transition_in(foo.$$.fragment, local);

			current = true;
		},

		o(local) {
			transition_out(foo.$$.fragment, local);
			current = false;
		},

		d(detaching) {
			destroy_component(foo, detaching);
		}
	};

Severity

Low