fix insert function (#6445)

src/runtime/internal/dom.ts

@@ -132,7 +132,7 @@ export function append(target: NodeEx, node: NodeEx) {
 export function insert(target: NodeEx, node: NodeEx, anchor?: NodeEx) {
 	if (is_hydrating && !anchor) {
 		append(target, node);
-	} else if (node.parentNode !== target || (anchor && node.nextSibling !== anchor)) {
+	} else if (node.parentNode !== target || node.nextSibling != anchor) {
 		target.insertBefore(node, anchor || null);
 	}
 }

test/runtime/samples/each-block-keyed-changed/_config.js

@@ -0,0 +1,13 @@
+export default {
+	props: {
+		titles: [{ name: 'a' }, { name: 'b' }, { name: 'c' }]
+	},
+
+	html: '<div class="container"><p>a</p><p>b</p><p>c</p></div>',
+
+	test({ assert, component, target }) {
+		component.titles = [{ name: 'b' }, { name: 'c' }, { name: 'a' }];
+
+		assert.htmlEqual(target.innerHTML, '<div class="container"><p>b</p><p>c</p><p>a</p></div>');
+	}
+};

test/runtime/samples/each-block-keyed-changed/main.svelte

@@ -0,0 +1,8 @@
+<script>
+	export let titles;
+</script>
+<div class="container">
+	{#each titles as title (title.name)}
+		<p>{title.name}</p>
+	{/each}
+</div>