failing test for #1527

test/runtime/samples/nested-transition-if-block-not-remounted/Span.html

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+<span><slot></slot></span>

test/runtime/samples/nested-transition-if-block-not-remounted/_config.js

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+export default {
+	data: {
+		x: true,
+		value: 'one'
+	},
+
+	html: `
+		<div>
+			<input>
+			<span>x</span>
+		</div>
+	`,
+
+	nestedTransitions: true,
+
+	test(assert, component, target, window, raf) {
+		const div = target.querySelector('div');
+		const { appendChild, insertBefore } = div;
+
+		div.appendChild = div.insertBefore = () => {
+			throw new Error('DOM was mutated');
+		};
+
+		component.set({ value: 'two' });
+	},
+};

test/runtime/samples/nested-transition-if-block-not-remounted/main.html

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+<div>
+	{#if x}
+		<input on:input="set({ value: this.value })">
+		<Span>x</Span>
+	{/if}
+</div>
+
+<script>
+	export default {
+		components: {
+			Span: './Span.html'
+		}
+	};
+</script>