Add test for context consumers inside hidden subtree

Should not bail out during subsequent update. (This isn't directly
related to this PR because we should have had this test, anyway.)

packages/react-reconciler/src/ReactFiberBeginWork.js

@@ -884,7 +884,7 @@ function updateHostComponent(current, workInProgress, renderExpirationTime) {
     shouldDeprioritizeSubtree(type, nextProps)
   ) {
     // Schedule this fiber to re-render at offscreen priority. Then bailout.
-    workInProgress.expirationTime = Never;
+    workInProgress.expirationTime = workInProgress.childExpirationTime = Never;
     return null;
   }
 

packages/react-reconciler/src/__tests__/ReactNewContext-test.internal.js

@@ -883,6 +883,37 @@ describe('ReactNewContext', () => {
         expect(ReactNoop.getChildren()).toEqual([span(2), span(2)]);
       });
 
+      it("context consumer doesn't bail out inside hidden subtree", () => {
+        const Context = React.createContext('dark');
+        const Consumer = getConsumer(Context);
+
+        function App({theme}) {
+          return (
+            <Context.Provider value={theme}>
+              <div hidden={true}>
+                <Consumer>{value => <Text text={value} />}</Consumer>
+              </div>
+            </Context.Provider>
+          );
+        }
+
+        ReactNoop.render(<App theme="dark" />);
+        expect(ReactNoop.flush()).toEqual(['dark']);
+        expect(ReactNoop.getChildrenAsJSX()).toEqual(
+          <div hidden={true}>
+            <span prop="dark" />
+          </div>,
+        );
+
+        ReactNoop.render(<App theme="light" />);
+        expect(ReactNoop.flush()).toEqual(['light']);
+        expect(ReactNoop.getChildrenAsJSX()).toEqual(
+          <div hidden={true}>
+            <span prop="light" />
+          </div>,
+        );
+      });
+
       // This is a regression case for https://github.com/facebook/react/issues/12389.
       it('does not run into an infinite loop', () => {
         const Context = React.createContext(null);