fix: Support previous breadcrumbs versions in deduplication

src/app-layout/__tests__/global-breadcrumbs.test.tsx

@@ -258,6 +258,37 @@ describeEachAppLayout({ themes: ['refresh-toolbar'], sizes: ['desktop'] }, () =>
     });
   });
 
+  test('renders breadcrumbs locally again after app layout de-registers', async () => {
+    function DestructibleLayout() {
+      const [mounted, setMounted] = useState(true);
+      return mounted ? (
+        <AppLayout
+          content={
+            <button data-testid="unmount" onClick={() => setMounted(false)}>
+              Unmount
+            </button>
+          }
+        />
+      ) : null;
+    }
+
+    await renderAsync(
+      <>
+        <div data-testid="local-breadcrumbs">
+          <BreadcrumbGroup items={defaultBreadcrumbs} />
+        </div>
+
+        <DestructibleLayout />
+      </>
+    );
+    expect(wrapper.find('[data-testid="local-breadcrumbs"]')!.getElement()).toBeEmptyDOMElement();
+
+    wrapper.find('[data-testid="unmount"]')!.click();
+    await waitFor(() => {
+      expect(wrapper.find('[data-testid="local-breadcrumbs"]')!.getElement()).not.toBeEmptyDOMElement();
+    });
+  });
+
   test('allows opt-out from this behavior', async () => {
     render(
       <AppLayout

src/app-layout/visual-refresh-toolbar/toolbar/index.tsx

@@ -195,14 +195,16 @@ export function AppLayoutToolbarImplementation({
         {(breadcrumbs || discoveredBreadcrumbs) && (
           <div className={clsx(styles['universal-toolbar-breadcrumbs'], testutilStyles.breadcrumbs)}>
             <BreadcrumbsSlotContext.Provider value={{ isInToolbar: true }}>
-              {breadcrumbs ||
-                (discoveredBreadcrumbs && (
+              <div className={styles['breadcrumbs-own']}>{breadcrumbs}</div>
+              {discoveredBreadcrumbs && (
+                <div className={styles['breadcrumbs-discovered']}>
                   <BreadcrumbGroupImplementation
                     {...discoveredBreadcrumbs}
                     data-awsui-discovered-breadcrumbs={true}
                     __injectAnalyticsComponentMetadata={true}
                   />
-                ))}
+                </div>
+              )}
             </BreadcrumbsSlotContext.Provider>
           </div>
         )}

src/app-layout/visual-refresh-toolbar/toolbar/styles.scss

@@ -99,6 +99,11 @@
   }
 }
 
+// backward compatibility before this commit: 7a4b7b3e3b1d50830383805a8f4ab6cd93c9701f
+.breadcrumbs-own:not(:empty) + .breadcrumbs-discovered {
+  display: none;
+}
+
 .block-body-scroll {
   overflow: hidden;
 }

src/internal/plugins/controllers/breadcrumbs.ts

@@ -3,6 +3,7 @@
 import debounce from '../../debounce';
 
 type ChangeCallback<T> = (props: T | null) => void;
+type RegistrationCallback = (isRegistered: boolean) => void;
 
 export interface BreadcrumbsGlobalRegistration<T> {
   update(props: T): void;
@@ -11,18 +12,18 @@ export interface BreadcrumbsGlobalRegistration<T> {
 
 export interface BreadcrumbsApiInternal<T> {
   registerAppLayout: (changeCallback: ChangeCallback<T>) => (() => void) | void;
-  registerBreadcrumbs: (props: T, onRegistered: () => void) => BreadcrumbsGlobalRegistration<T>;
+  registerBreadcrumbs: (props: T, onRegistered: RegistrationCallback) => BreadcrumbsGlobalRegistration<T>;
   getStateForTesting: () => {
     appLayoutUpdateCallback: ChangeCallback<T> | null;
     breadcrumbInstances: Array<{ props: T }>;
-    breadcrumbRegistrations: Array<() => void>;
+    breadcrumbRegistrations: Array<RegistrationCallback>;
   };
 }
 
 export class BreadcrumbsController<T> {
   #appLayoutUpdateCallback: ChangeCallback<T> | null = null;
   #breadcrumbInstances: Array<{ props: T }> = [];
-  #breadcrumbRegistrations: Array<() => void> = [];
+  #breadcrumbRegistrations: Array<RegistrationCallback> = [];
 
   #notifyAppLayout = debounce(() => {
     if (!this.#appLayoutUpdateCallback) {
@@ -33,10 +34,7 @@ export class BreadcrumbsController<T> {
   }, 0);
 
   #notifyBreadcrumbs = debounce(() => {
-    if (!this.#appLayoutUpdateCallback) {
-      return;
-    }
-    this.#breadcrumbRegistrations.forEach(listener => listener());
+    this.#breadcrumbRegistrations.forEach(listener => listener(!!this.#appLayoutUpdateCallback));
   }, 0);
 
   registerAppLayout = (changeCallback: ChangeCallback<T>) => {
@@ -47,10 +45,11 @@ export class BreadcrumbsController<T> {
     this.#notifyBreadcrumbs();
     return () => {
       this.#appLayoutUpdateCallback = null;
+      this.#notifyBreadcrumbs();
     };
   };
 
-  registerBreadcrumbs = (props: T, onRegistered: () => void): BreadcrumbsGlobalRegistration<T> => {
+  registerBreadcrumbs = (props: T, onRegistered: RegistrationCallback): BreadcrumbsGlobalRegistration<T> => {
     const instance = { props: props };
     this.#breadcrumbInstances.push(instance);
     this.#breadcrumbRegistrations.push(onRegistered);

src/internal/plugins/helpers/use-global-breadcrumbs.ts

@@ -20,7 +20,9 @@ function useSetGlobalBreadcrumbsImplementation({
     if (isInToolbar || __disableGlobalization) {
       return;
     }
-    const registration = awsuiPluginsInternal.breadcrumbs.registerBreadcrumbs(props, () => setRegistered(true));
+    const registration = awsuiPluginsInternal.breadcrumbs.registerBreadcrumbs(props, isRegistered =>
+      setRegistered(isRegistered ?? true)
+    );
     registrationRef.current = registration;
 
     return () => {