fix blocks inside <svelte:head> - closes #1774

src/compile/render-dom/wrappers/Head.ts

@@ -21,7 +21,7 @@ export default class HeadWrapper extends Wrapper {
 			renderer,
 			block,
 			node.children,
-			parent,
+			this,
 			stripWhitespace,
 			nextSibling
 		);

test/runtime/samples/head-if-block/_config.js

@@ -0,0 +1,12 @@
+export default {
+	data: {
+		condition: false
+	},
+
+	test(assert, component, target, window) {
+		assert.equal(window.document.title, '');
+
+		component.set({ condition: true });
+		assert.equal(window.document.title, 'woo!!!');
+	}
+};

test/runtime/samples/head-if-block/main.html

@@ -0,0 +1,5 @@
+<svelte:head>
+	{#if condition}
+		<title>woo!!!</title>
+	{/if}
+</svelte:head>