Revert "fix(cdk/a11y): activeItem out of date if active index is removed from ListKeyManager (#14471)" (#24233)

This reverts commit e61c2fa.

(cherry picked from commit 8504c77)

Author: andrewseguin

src/cdk/a11y/key-manager/list-key-manager.spec.ts

@@ -82,28 +82,15 @@ describe('Key managers', () => {
       spyOn(keyManager, 'setActiveItem').and.callThrough();
     });
 
-    it('should maintain the active item if the amount of items changes', fakeAsync(() => {
+    it('should maintain the active item if the amount of items changes', () => {
       expect(keyManager.activeItemIndex).toBe(0);
       expect(keyManager.activeItem!.getLabel()).toBe('one');
       itemList.reset([new FakeFocusable('zero'), ...itemList.toArray()]);
       itemList.notifyOnChanges();
-      tick();
 
       expect(keyManager.activeItemIndex).toBe(1);
       expect(keyManager.activeItem!.getLabel()).toBe('one');
-    }));
-
-    it('should keep the active item in sync if the active item is removed', fakeAsync(() => {
-      expect(keyManager.activeItemIndex).toBe(0);
-      expect(keyManager.activeItem!.getLabel()).toBe('one');
-
-      itemList.reset(itemList.toArray().slice(1));
-      itemList.notifyOnChanges();
-      tick();
-
-      expect(keyManager.activeItemIndex).toBe(0);
-      expect(keyManager.activeItem!.getLabel()).toBe('two');
-    }));
+    });
 
     it('should start off the activeItem as null', () => {
       expect(new ListKeyManager([]).activeItem).toBeNull();

src/cdk/a11y/key-manager/list-key-manager.ts

@@ -70,11 +70,8 @@ export class ListKeyManager<T extends ListKeyManagerOption> {
           const itemArray = newItems.toArray();
           const newIndex = itemArray.indexOf(this._activeItem);
 
-          if (newIndex !== this._activeItemIndex) {
-            // Timeout is required to avoid "changed after checked" errors.
-            setTimeout(() => {
-              this.setActiveItem(newIndex > -1 ? newIndex : this._activeItemIndex);
-            }, 0);
+          if (newIndex > -1 && newIndex !== this._activeItemIndex) {
+            this._activeItemIndex = newIndex;
           }
         }
       });

src/material-experimental/mdc-menu/menu.spec.ts

@@ -1176,7 +1176,6 @@ describe('MDC-based MatMenu', () => {
       fixture.detectChanges();
       tick(500);
       fixture.detectChanges();
-      tick();
 
       expect(fixture.componentInstance.items.length).toBe(0);
     }));
@@ -1202,7 +1201,6 @@ describe('MDC-based MatMenu', () => {
         .toBe(true);
       tick(500);
       fixture.detectChanges();
-      tick();
 
       expect(trigger.menuOpen).withContext('Expected menu to be closed').toBe(false);
     }));

src/material/menu/menu.spec.ts

@@ -1171,7 +1171,6 @@ describe('MatMenu', () => {
       fixture.detectChanges();
       tick(500);
       fixture.detectChanges();
-      tick();
 
       expect(fixture.componentInstance.items.length).toBe(0);
     }));
@@ -1197,7 +1196,6 @@ describe('MatMenu', () => {
         .toBe(true);
       tick(500);
       fixture.detectChanges();
-      tick();
 
       expect(trigger.menuOpen).withContext('Expected menu to be closed').toBe(false);
     }));