From e5299554d0849bf1e009c2fa29f4310c38787188 Mon Sep 17 00:00:00 2001
From: yushangjiang <504427021@qq.com>
Date: Wed, 26 Feb 2020 23:01:53 +0800
Subject: [PATCH 1/2] fix(componentRenderUtils): a wrong judge in
 shouldUpdateComponent (#677)

---
 packages/runtime-core/src/componentRenderUtils.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/runtime-core/src/componentRenderUtils.ts b/packages/runtime-core/src/componentRenderUtils.ts
index 6b3be672792..b7646d72a8b 100644
--- a/packages/runtime-core/src/componentRenderUtils.ts
+++ b/packages/runtime-core/src/componentRenderUtils.ts
@@ -183,7 +183,7 @@ export function shouldUpdateComponent(
       return hasPropsChanged(prevProps!, nextProps!)
     } else {
       if (patchFlag & PatchFlags.CLASS) {
-        return prevProps!.class === nextProps!.class
+        return prevProps!.class !== nextProps!.class
       }
       if (patchFlag & PatchFlags.STYLE) {
         return hasPropsChanged(prevProps!.style, nextProps!.style)

From a88c2c8a23b6a63d4ecfa406ec7c0cf48bf3ae7b Mon Sep 17 00:00:00 2001
From: yushangjiang <504427021@qq.com>
Date: Thu, 27 Feb 2020 21:37:57 +0800
Subject: [PATCH 2/2] fix(componentRenderUtils): keep component root's patch
 flag the same as component-tag (#677)

---
 packages/runtime-core/src/componentRenderUtils.ts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/packages/runtime-core/src/componentRenderUtils.ts b/packages/runtime-core/src/componentRenderUtils.ts
index b7646d72a8b..8738da5660f 100644
--- a/packages/runtime-core/src/componentRenderUtils.ts
+++ b/packages/runtime-core/src/componentRenderUtils.ts
@@ -64,6 +64,13 @@ export function renderComponentRoot(
       result = normalizeVNode(
         instance.render!.call(proxyToUse, proxyToUse, renderCache)
       )
+      // root node should inherit class/style in component tag and patch
+      if (vnode.patchFlag & PatchFlags.CLASS) {
+        result.patchFlag |= PatchFlags.CLASS
+      }
+      if (vnode.patchFlag & PatchFlags.STYLE) {
+        result.patchFlag |= PatchFlags.STYLE
+      }
     } else {
       // functional
       const render = Component as FunctionalComponent