fix parent in slot wrapper (#4705)

src/compiler/compile/render_dom/wrappers/Slot.ts

@@ -45,7 +45,7 @@ export default class SlotWrapper extends Wrapper {
 			renderer,
 			this.fallback,
 			node.children,
-			parent,
+			this,
 			strip_whitespace,
 			next_sibling
 		);

test/runtime/samples/slot-if-block-update-no-anchor/_config.js

@@ -0,0 +1,7 @@
+export default {
+	test({ assert, target, component }) {
+		assert.htmlEqual(target.innerHTML, `<span></span>`);
+		component.enabled = true;
+		assert.htmlEqual(target.innerHTML, `<span>enabled</span>`);
+	},
+};

test/runtime/samples/slot-if-block-update-no-anchor/main.svelte

@@ -0,0 +1,9 @@
+<script>
+	export let enabled = false;
+</script>
+
+<span>
+	<slot>
+		{#if enabled}enabled{/if}
+	</slot>
+</span>