fix(angular): nav controller can pop views after leaving tabs outlet

angular/src/directives/navigation/ion-router-outlet.ts

@@ -308,8 +308,19 @@ export class IonRouterOutlet implements OnDestroy, OnInit {
     }
 
     this.activatedView = enteringView;
+
+    /**
+     * The top outlet is set prior to the entering view's transition completing,
+     * so that when we have nested outlets (e.g. ion-tabs inside an ion-router-outlet),
+     * the tabs outlet will be assigned as the top outlet when a view inside tabs is
+     * activated.
+     *
+     * In this scenario, activeWith is called for both the tabs and the root router outlet.
+     * To avoid a race condition, we assign the top outlet synchronously.
+     */
+    this.navCtrl.setTopOutlet(this);
+
     this.stackCtrl.setActive(enteringView).then((data) => {
-      this.navCtrl.setTopOutlet(this);
       this.activateEvents.emit(cmpRef.instance);
       this.stackEvents.emit(data);
     });

angular/test/base/e2e/src/tabs.spec.ts

@@ -243,6 +243,74 @@ describe('Tabs', () => {
     });
   })
 
+  describe('entry url - /tabs/account', () => {
+    beforeEach(() => {
+      cy.visit('/tabs/account');
+    });
+    it('should pop to previous view when leaving tabs outlet', () => {
+
+      cy.get('ion-title').should('contain.text', 'Tab 1 - Page 1');
+
+      cy.get('#goto-tab1-page2').click();
+
+      cy.get('ion-title').should('contain.text', 'Tab 1 - Page 2 (1)');
+
+      cy.get('#goto-global').click();
+
+      cy.get('ion-title').should('contain.text', 'Global Page');
+
+      cy.get('#goto-prev-pop').click();
+
+      cy.get('ion-title').should('contain.text', 'Tab 1 - Page 2 (1)');
+
+      cy.get('#goto-prev').click();
+
+      cy.get('ion-title').should('contain.text', 'Tab 1 - Page 1');
+
+      /**
+       * Verifies that when entering the tabs outlet directly,
+       * the navController.pop() method does not pop the previous view,
+       * when you are at the root of the tabs outlet.
+       */
+      cy.get('#goto-previous-page').click();
+      cy.get('ion-title').should('contain.text', 'Tab 1 - Page 1');
+    });
+  });
+
+  describe('entry url - /', () => {
+    it('should pop to the root outlet from the tabs outlet', () => {
+      cy.visit('/');
+
+      cy.get('ion-title').should('contain.text', 'Test App');
+
+      cy.get('ion-item').contains('Tabs test').click();
+
+      cy.get('ion-title').should('contain.text', 'Tab 1 - Page 1');
+
+      cy.get('#goto-tab1-page2').click();
+
+      cy.get('ion-title').should('contain.text', 'Tab 1 - Page 2 (1)');
+
+      cy.get('#goto-global').click();
+
+      cy.get('ion-title').should('contain.text', 'Global Page');
+
+      cy.get('#goto-prev-pop').click();
+
+      cy.get('ion-title').should('contain.text', 'Tab 1 - Page 2 (1)');
+
+      cy.get('#goto-prev').click();
+
+      cy.get('ion-title').should('contain.text', 'Tab 1 - Page 1');
+
+      cy.get('#goto-previous-page').click();
+
+      cy.get('ion-title').should('contain.text', 'Test App');
+
+    });
+  });
+
+
   describe('entry url - /tabs/account/nested/1', () => {
     beforeEach(() => {
       cy.visit('/tabs/account/nested/1');

angular/test/base/src/app/app-routing.module.ts

@@ -55,6 +55,10 @@ const routes: Routes = [
     path: 'tabs',
     loadChildren: () => import('./tabs/tabs.module').then(m => m.TabsPageModule)
   },
+  {
+    path: 'tabs-global',
+    loadChildren: () => import('./tabs-global/tabs-global.module').then(m => m.TabsGlobalModule)
+  },
   {
     path: 'nested-outlet',
     component: NestedOutletComponent,
@@ -68,7 +72,7 @@ const routes: Routes = [
         component: NestedOutletPage2Component
       }
     ]
-  }
+  },
 ];
 
 @NgModule({

angular/test/base/src/app/tabs-global/tabs-global-routing.module.ts

@@ -0,0 +1,16 @@
+import { NgModule } from "@angular/core";
+import { RouterModule } from "@angular/router";
+import { TabsGlobalComponent } from "./tabs-global.component";
+
+@NgModule({
+  imports: [
+    RouterModule.forChild([
+      {
+        path: '',
+        component: TabsGlobalComponent
+      }
+    ])
+  ],
+  exports: [RouterModule]
+})
+export class TabsGlobalRoutingModule { }

angular/test/base/src/app/tabs-global/tabs-global.component.html

@@ -0,0 +1,17 @@
+<ion-header>
+  <ion-toolbar>
+    <ion-buttons slot="start">
+      <ion-back-button></ion-back-button>
+    </ion-buttons>
+
+    <ion-title>
+      Global Page
+    </ion-title>
+  </ion-toolbar>
+</ion-header>
+
+<ion-content>
+  <ion-content>
+    <ion-button id="goto-prev-pop" (click)="navCtrl.pop()">Go To Previous</ion-button>
+  </ion-content>
+</ion-content>

angular/test/base/src/app/tabs-global/tabs-global.component.ts

@@ -0,0 +1,17 @@
+import { Component } from "@angular/core";
+import { NavController } from "@ionic/angular";
+
+/**
+ * This component is used in conjunction with a tabs router-outlet,
+ * to validate the behavior of different routing APIs (e.g. NavController)
+ * when leaving and re-entering a router-outlet.
+ */
+@Component({
+  selector: 'app-tabs-global',
+  templateUrl: 'tabs-global.component.html'
+})
+export class TabsGlobalComponent {
+
+  constructor(public navCtrl: NavController) { }
+
+}

angular/test/base/src/app/tabs-global/tabs-global.module.ts

@@ -0,0 +1,13 @@
+import { NgModule } from "@angular/core";
+import { IonicModule } from "@ionic/angular";
+import { TabsGlobalRoutingModule } from "./tabs-global-routing.module";
+import { TabsGlobalComponent } from "./tabs-global.component";
+
+@NgModule({
+  imports: [
+    IonicModule,
+    TabsGlobalRoutingModule
+  ],
+  declarations: [TabsGlobalComponent]
+})
+export class TabsGlobalModule { }

angular/test/base/src/app/tabs-tab1-nested/tabs-tab1-nested.component.html

@@ -12,6 +12,9 @@ <h1>Welcome to NESTED PAGE {{id}}</h1>
   <p>
     <ion-button routerLink="/tabs/account" id="goto-tab1-page1">Go to Tab 1 - Page 1</ion-button>
     <ion-button routerLink="/tabs/contact" id="goto-tab2-page1">Go to Tab 2 - Page 1</ion-button>
+    <ion-button routerLink="/tabs-global" id="goto-global">Go to Global Page</ion-button>
+    <ion-button routerLink="/tabs-global" id="goto-prev" (click)="navCtrl.pop()">Go to Previous Page (NavController).
+    </ion-button>
     <ion-button routerLink="/tabs/account/nested/{{next()}}" id="goto-next">Go to Next</ion-button>
   </p>
 </ion-content>

angular/test/base/src/app/tabs-tab1-nested/tabs-tab1-nested.component.ts

@@ -1,5 +1,6 @@
 import { ActivatedRoute } from '@angular/router';
 import { Component, OnInit } from '@angular/core';
+import { NavController } from '@ionic/angular';
 
 @Component({
   selector: 'app-tabs-tab1-nested',
@@ -9,7 +10,8 @@ export class TabsTab1NestedComponent implements OnInit {
   id = '';
   constructor(
     private route: ActivatedRoute,
-  ) {}
+    public navCtrl: NavController
+  ) { }
 
   ngOnInit() {
     this.id = this.route.snapshot.paramMap.get('id');
@@ -18,4 +20,5 @@ export class TabsTab1NestedComponent implements OnInit {
   next() {
     return parseInt(this.id, 10) + 1;
   }
+
 }

angular/test/base/src/app/tabs-tab1/tabs-tab1.component.html

@@ -19,5 +19,6 @@ <h1>Welcome to Tab1</h1>
       id="goto-nested-page1-with-query-params">Go to Page 2 with Query Params</ion-button>
     <ion-button routerLink="/tabs/lazy/nested" id="goto-tab3-page2">Go to Tab 3 - Page 2</ion-button>
     <ion-button routerLink="/nested-outlet/page" id="goto-nested-page1">Go to nested</ion-button>
+    <ion-button (click)="navCtrl.pop()" id="goto-previous-page">Go to Previous Page</ion-button>
   </p>
 </ion-content>

angular/test/base/src/app/tabs-tab1/tabs-tab1.component.ts

@@ -1,4 +1,5 @@
 import { Component, NgZone } from '@angular/core';
+import { NavController } from '@ionic/angular';
 
 @Component({
   selector: 'app-tabs-tab1',
@@ -9,6 +10,8 @@ export class TabsTab1Component {
   segment = 'one';
   changed = 'false';
 
+  constructor(public navCtrl: NavController) {}
+
   ionViewWillEnter() {
     NgZone.assertInAngularZone();
     setTimeout(() => {