propagate scope changes across chained slots - fixes #2359

src/compile/render-dom/wrappers/InlineComponent/index.ts

@@ -156,7 +156,7 @@ export default class InlineComponentWrapper extends Wrapper {
 			component_opts.push(`$$inline: true`);
 		}
 
-		const fragment_dependencies = new Set();
+		const fragment_dependencies = new Set(this.fragment ? ['$$scope'] : []);
 		this.slots.forEach(slot => {
 			slot.block.dependencies.forEach(name => {
 				const is_let = slot.scope.is_let(name);

test/runtime/samples/component-slot-chained/Inner.svelte

@@ -0,0 +1 @@
+<slot/>

test/runtime/samples/component-slot-chained/Outer.svelte

@@ -0,0 +1,7 @@
+<script>
+	import Inner from './Inner.svelte';
+</script>
+
+<Inner>
+	<slot/>
+</Inner>

test/runtime/samples/component-slot-chained/_config.js

@@ -0,0 +1,8 @@
+export default {
+	html: 'one',
+
+	test({ assert, component, target }) {
+		component.text = 'two';
+		assert.htmlEqual(target.innerHTML, `two`);
+	}
+};

test/runtime/samples/component-slot-chained/main.svelte

@@ -0,0 +1,9 @@
+<script>
+	import Outer from './Outer.svelte';
+
+	export let text = 'one';
+</script>
+
+<Outer>
+	{text}
+</Outer>