fix(core): Run component disposal before destroyRootHostView() to avoid crash if change detection is triggered.

Closes #5226

modules/angular2/src/core/linker/dynamic_component_loader.ts

@@ -249,10 +249,10 @@ export class DynamicComponentLoader_ extends DynamicComponentLoader {
       var component = this._viewManager.getComponent(newLocation);
 
       var dispose = () => {
-        this._viewManager.destroyRootHostView(hostViewRef);
         if (isPresent(onDispose)) {
           onDispose();
         }
+        this._viewManager.destroyRootHostView(hostViewRef);
       };
       return new ComponentRef_(newLocation, component, type, injector, dispose);
     });

modules/angular2/test/platform/bootstrap_spec.ts

@@ -13,7 +13,7 @@ import {
 import {IS_DART, isPresent, stringify} from 'angular2/src/facade/lang';
 import {bootstrap} from 'angular2/platform/browser';
 import {ApplicationRef} from 'angular2/src/core/application_ref';
-import {Component, Directive, View, platform} from 'angular2/core';
+import {Component, Directive, View, OnDestroy, platform} from 'angular2/core';
 import {BROWSER_PROVIDERS, BROWSER_APP_PROVIDERS} from 'angular2/platform/browser';
 import {DOM} from 'angular2/src/core/dom/dom_adapter';
 import {DOCUMENT} from 'angular2/render';
@@ -67,6 +67,15 @@ class HelloRootMissingTemplate {
 class HelloRootDirectiveIsNotCmp {
 }
 
+@Component({selector: 'hello-app'})
+@View({template: ''})
+class HelloOnDestroyTickCmp implements OnDestroy {
+  appRef: ApplicationRef;
+  constructor(@Inject(ApplicationRef) appRef) { this.appRef = appRef; }
+
+  onDestroy(): void { this.appRef.tick(); }
+}
+
 class _ArrayLogger {
   res: any[] = [];
   log(s: any): void { this.res.push(s); }
@@ -163,6 +172,15 @@ export function main() {
              });
        }));
 
+    it('should not crash if change detection is invoked when the root component is disposed',
+       inject([AsyncTestCompleter], (async) => {
+         bootstrap(HelloOnDestroyTickCmp, testProviders)
+             .then((ref) => {
+               expect(() => ref.dispose()).not.toThrow();
+               async.done();
+             });
+       }));
+
     it('should unregister change detectors when components are disposed',
        inject([AsyncTestCompleter], (async) => {
          var app = platform(BROWSER_PROVIDERS).application([BROWSER_APP_PROVIDERS, testProviders]);