clear refs in destroy, not unmount, so that refs are populated in ondestroy. fixes #706

src/generators/dom/visitors/Element/Ref.ts

@@ -17,7 +17,7 @@ export default function visitRef(
 		`#component.refs.${name} = ${state.parentNode};`
 	);
 
-	block.builders.unmount.addLine(deindent`
+	block.builders.destroy.addLine(deindent`
 		if ( #component.refs.${name} === ${state.parentNode} ) #component.refs.${name} = null;
 	`);
 

test/runtime/samples/ondestroy-before-cleanup/Top.html

@@ -0,0 +1,9 @@
+<div ref:element></div>
+
+<script>
+	export default {
+		ondestroy() {
+			this.refOnDestroy = this.refs.element;
+		}
+	};
+</script>

test/runtime/samples/ondestroy-before-cleanup/_config.js

@@ -0,0 +1,9 @@
+export default {
+	test(assert, component, target) {
+		const top = component.refs.top;
+		const div = target.querySelector('div');
+
+		component.set({ visible: false });
+		assert.equal(top.refOnDestroy, div);
+	}
+};

test/runtime/samples/ondestroy-before-cleanup/main.html

@@ -0,0 +1,18 @@
+{{#if visible}}
+	<Top ref:top></Top>
+{{/if}}
+
+<script>
+	import Top from './Top.html';
+	
+	export default {
+		data() {
+			return {
+				visible: true
+			};
+		},
+		components: {
+			Top
+		}
+	};
+</script>