Revert "fix: skip derived re-evaluation inside inert effect blocks" (#17869)

Reverts sveltejs/svelte#17852, because it isn't a real fix
https://github.com/sveltejs/svelte/pull/17868

.changeset/chatty-papers-sing.md

@@ -1,5 +0,0 @@
----
-'svelte': patch
----
-
-fix: skip derived re-evaluation inside inert effect blocks

packages/svelte/src/internal/client/reactivity/deriveds.js

@@ -10,8 +10,7 @@ import {
 	ASYNC,
 	WAS_MARKED,
 	DESTROYED,
-	CLEAN,
+	CLEAN
-	INERT
 } from '#client/constants';
 import {
 	active_reaction,
@@ -306,22 +305,10 @@ function get_derived_parent_effect(derived) {
  * @returns {T}
  */
 export function execute_derived(derived) {
-	var parent_effect = get_derived_parent_effect(derived);
-
-	// don't update `{@const ...}` in an outroing block
-	if (
-		!async_mode_flag &&
-		!is_destroying_effect &&
-		parent_effect !== null &&
-		(parent_effect.f & INERT) !== 0
-	) {
-		return derived.v;
-	}
-
 	var value;
 	var prev_active_effect = active_effect;
 
-	set_active_effect(parent_effect);
+	set_active_effect(get_derived_parent_effect(derived));
 
 	if (DEV) {
 		let prev_eager_effects = eager_effects;

packages/svelte/tests/runtime-runes/samples/if-block-const-inert-derived/_config.js

@@ -1,18 +0,0 @@
-import { flushSync, tick } from 'svelte';
-import { test } from '../../test';
-
-export default test({
-	html: '<button>clear</button><div><p>hello</p></div>',
-
-	async test({ assert, target, raf, logs }) {
-		const [button] = target.querySelectorAll('button');
-
-		flushSync(() => button.click());
-		assert.deepEqual(logs, ['hello']);
-
-		// Let the transition finish and clean up
-		raf.tick(100);
-
-		assert.htmlEqual(target.innerHTML, '<button>clear</button>');
-	}
-});

packages/svelte/tests/runtime-runes/samples/if-block-const-inert-derived/main.svelte

@@ -1,32 +0,0 @@
-<script>
-	let value = $state('hello');
-
-	function compute(v) {
-		console.log(v);
-		return { data: v, ready: true };
-	}
-
-	function fade(node) {
-		return {
-			duration: 100,
-			tick: (t) => {
-				node.style.opacity = String(t);
-			}
-		};
-	}
-</script>
-
-<button
-	onclick={() => {
-		value = undefined;
-	}}>clear</button
->
-
-{#if value}
-	{@const result = compute(value)}
-	{#if result.ready}
-		<div out:fade|global>
-			<p>{result.data}</p>
-		</div>
-	{/if}
-{/if}