fix(ViewController): nav must be set as soon as possible

fixes regression in 5a4c6093a72059577544dafe372e06018ee1ed19
fixes #10654

src/components/app/app.ts

@@ -220,6 +220,10 @@ export class App {
   present(enteringView: ViewController, opts: NavOptions, appPortal?: AppPortal): Promise<any> {
     const portal = this._appRoot._getPortal(appPortal);
 
+    // Set Nav must be set here in order to dimiss() work synchnously.
+    // TODO: move _setNav() to the earlier stages of NavController. _queueTrns()
+    enteringView._setNav(portal);
+
     opts.keyboardClose = false;
     opts.direction = DIRECTION_FORWARD;
 

src/components/loading/test/basic/app.module.ts

@@ -254,6 +254,21 @@ export class E2EPage {
       this.navCtrl.push(Page2);
     }, 500);
   }
+
+  presentLoadingOpenDismiss() {
+    // debugger;
+    const loading = this.loadingCtrl.create({
+      content: 'Loading 1'
+    });
+    loading.present();
+    loading.dismiss();
+
+    const loading2 = this.loadingCtrl.create({
+      content: 'Loading 2'
+    });
+    loading2.present();
+    loading2.dismiss();
+  }
 }
 
 @Component({

src/components/loading/test/basic/main.html

@@ -22,6 +22,7 @@
   <button ion-button block (click)="presentLoadingMultiple()" color="danger">Multiple Loading</button>
   <button ion-button block (click)="presentLoadingMultipleNav()" color="danger">Multiple Nav Loading</button>
   <button ion-button block (click)="presentLoadingDismissNav()">Dismiss Page Change</button>
+  <button ion-button block (click)="presentLoadingOpenDismiss()">Open->Dismiss (x2)</button>
 
 </ion-content>
 

src/navigation/nav-controller-base.ts

@@ -775,7 +775,7 @@ export class NavControllerBase extends Ion implements NavController {
       assert(view._nav === this, 'view is not part of the nav');
       this._views.splice(index, 0, this._views.splice(existingIndex, 1)[0]);
     } else {
-      assert(!view._nav, 'nav is used');
+      assert(!view._nav || (this._isPortal && view._nav === this), 'nav is used');
       // this is a new view to add to the stack
       // create the new entering view
       view._setNav(this);

src/navigation/view-controller.ts

@@ -165,6 +165,7 @@ export class ViewController {
    */
   dismiss(data?: any, role?: any, navOptions: NavOptions = {}): Promise<any> {
     if (!this._nav) {
+      assert(this._state === ViewState.DESTROYED, 'ViewController does not have a valid _nav');
       return Promise.resolve(false);
     }
     if (this.isOverlay && !navOptions.minClickBlockDuration) {