fix tests

compat/test/browser/cloneElement.test.js

@@ -20,12 +20,17 @@ describe('compat cloneElement', () => {
 				a<span>b</span>
 			</foo>
 		);
-		expect(cloneElement(element)).to.eql(element);
+		const clone = cloneElement(element);
+		delete clone._original;
+		delete element._original;
+		expect(clone).to.eql(element);
 	});
 
 	it('should support props.children', () => {
 		let element = <foo children={<span>b</span>} />;
 		let clone = cloneElement(element);
+		delete clone._original;
+		delete element._original;
 		expect(clone).to.eql(element);
 		expect(cloneElement(clone).props.children).to.eql(element.props.children);
 	});
@@ -37,6 +42,8 @@ describe('compat cloneElement', () => {
 			</foo>
 		);
 		let clone = cloneElement(element);
+		delete clone._original;
+		delete element._original;
 		expect(clone).to.eql(element);
 		expect(clone.props.children.type).to.eql('div');
 	});

jsx-runtime/src/index.js

@@ -35,11 +35,10 @@ function createVNode(type, props, key, __source, __self) {
 		_component: null,
 		_hydrating: null,
 		constructor: undefined,
-		_original: undefined,
+		_original: 0,
 		__source,
 		__self
 	};
-	vnode._original = vnode;
 
 	// If a Component VNode, check for and apply defaultProps.
 	// Note: `type` is often a String, and can be `undefined` in development.

src/component.js

@@ -123,7 +123,7 @@ function renderComponent(component) {
 	if (parentDom) {
 		let commitQueue = [];
 		const oldVNode = assign({}, vnode);
-		oldVNode._original = {};
+		oldVNode._original = vnode._original + 1;
 
 		let newDom = diff(
 			parentDom,

src/diff/index.js

@@ -247,6 +247,12 @@ export function diff(
 			}
 
 			c._force = false;
+		} else if (
+			excessDomChildren == null &&
+			newVNode._original === oldVNode._original
+		) {
+			newVNode._children = oldVNode._children;
+			newVNode._dom = oldVNode._dom;
 		} else {
 			newVNode._dom = diffElementNodes(
 				oldVNode._dom,