4a8d5ae970
Close #39296 Fix an issue that `markDirty()` will not trigger change detection. The case is for example we have the following component. ``` export class AppComponent implements OnInit { constructor(private router: Router) {} ngOnInit() { this.router.events .pipe(filter((e) => e instanceof NavigationEnd)) .subscribe(() => ɵmarkDirty(this)); } } export class CounterComponent implements OnInit, OnDestroy { ngOnInit() { this.countSubject.pipe(takeUntil(this.destroy)).subscribe((count) => { this.count = count; ɵmarkDirty(this); }); } ``` Then the app navigate from `AppComponent` to `CounterComponent`, so there are 2 `markDirty()` call at in a row. The `1st` call is from `AppComponent` when router changed, the `2nd` call is from `CounterComponent.ngOnInit()`. And the `markDirty()->scheduleTick()` code look like this ``` function scheduleTick(rootContext, flags) { const nothingScheduled = rootContext.flags === 0 /* Empty */; rootContext.flags |= flags; if (nothingScheduled && rootContext.clean == _CLEAN_PROMISE) { rootContext.schedule(() => { ... if (rootContext.flags & RootContextFlags.DetectChanges) rootContext.flags &= ~RootContextFlags.DetectChanges; tickContext(); rootContext.clean = _CLEAN_PROMISE; ... }); ``` So in this case, the `1st` markDirty() will 1. set rootContext.flags = 1 2. before `tickContext()`, reset rootContext.flags = 0 3. inside `tickContext()`, it will call `CounterComponent.ngOnint()`, so the `2nd` markDirty() is called. 4. and the `2nd` scheduleTick is called, `nothingScheduled` is true, but rootContext.clean is not `_CLEAN_PROMISE` yet, since the `1st` markDirty tick is still running. 5. So nowhere will reset the `rootContext.flags`. 6. then in the future, any other `markDirty()` call will not trigger the tick, since `nothingScheduled` is always false. So `nothingScheduled` means no tick is scheduled, `rootContext.clean === _CLEAN_PROMISE` means no tick is running. So we should set the flags to `rootContext` only when `no tick is scheudled or running`. PR Close #39316 |
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