From 6665a52bad7072f2b758875a36173aaee8a52e47 Mon Sep 17 00:00:00 2001
From: Rich Harris <richard.a.harris@gmail.com>
Date: Fri, 30 Aug 2019 13:35:05 -0400
Subject: [PATCH] update simple if-blocks with complex but static conditions

---
 src/compiler/compile/render_dom/wrappers/IfBlock.ts  |  4 ++++
 .../if-block-static-with-dynamic-contents/_config.js | 12 ++++++++++++
 .../main.svelte                                      |  9 +++++++++
 3 files changed, 25 insertions(+)
 create mode 100644 test/runtime/samples/if-block-static-with-dynamic-contents/_config.js
 create mode 100644 test/runtime/samples/if-block-static-with-dynamic-contents/main.svelte

diff --git a/src/compiler/compile/render_dom/wrappers/IfBlock.ts b/src/compiler/compile/render_dom/wrappers/IfBlock.ts
index f12929ffb1..64b90ecaf3 100644
--- a/src/compiler/compile/render_dom/wrappers/IfBlock.ts
+++ b/src/compiler/compile/render_dom/wrappers/IfBlock.ts
@@ -493,6 +493,10 @@ export default class IfBlockWrapper extends Wrapper {
 					}
 				`);
 			}
+		} else if (dynamic) {
+			block.builders.update.add_block(
+				`if (${branch.condition}) ${name}.p(changed, ctx);`
+			);
 		}
 
 		block.builders.destroy.add_line(`${if_name}${name}.d(${detaching});`);
diff --git a/test/runtime/samples/if-block-static-with-dynamic-contents/_config.js b/test/runtime/samples/if-block-static-with-dynamic-contents/_config.js
new file mode 100644
index 0000000000..c5c99c5305
--- /dev/null
+++ b/test/runtime/samples/if-block-static-with-dynamic-contents/_config.js
@@ -0,0 +1,12 @@
+export default {
+	props: {
+		foo: 42
+	},
+
+	html: '<p>42</p>',
+
+	test({ assert, component, target }) {
+		component.foo = 43;
+		assert.htmlEqual(target.innerHTML, '<p>43</p>');
+	}
+};
diff --git a/test/runtime/samples/if-block-static-with-dynamic-contents/main.svelte b/test/runtime/samples/if-block-static-with-dynamic-contents/main.svelte
new file mode 100644
index 0000000000..57484f252f
--- /dev/null
+++ b/test/runtime/samples/if-block-static-with-dynamic-contents/main.svelte
@@ -0,0 +1,9 @@
+<script>
+	export let foo;
+
+	const show = () => true;
+</script>
+
+{#if show()}
+	<p>{foo}</p>
+{/if}