fix-next(modal) fix crash when closing modal dialog with root tabview inside (#5446)

tests/app/ui/page/page-tests-common.ts

@@ -22,6 +22,7 @@ import { View, PercentLength, Observable, unsetValue, EventData, isIOS } from "t
 import { Frame, stack } from "tns-core-modules/ui/frame";
 import { Label } from "tns-core-modules/ui/label";
 import { Color } from "tns-core-modules/color";
+import { TabView, TabViewItem } from "tns-core-modules/ui/tab-view/tab-view";
 
 export function addLabelToPage(page: Page, text?: string) {
     const label = new Label();
@@ -460,6 +461,60 @@ export function test_WhenNavigatingForwardAndBack_IsBackNavigationIsCorrect() {
     helper.goBack();
 }
 
+export function test_WhenRootTabViewShownModallyItCanCloseModal() {
+    let modalClosed = false;
+
+    const modalCloseCallback = function (returnValue: any) {
+        modalClosed = true;
+    }
+
+    const createTabItems = function(count: number) {
+        var items = new Array<TabViewItem>();
+
+        for (var i = 0; i < count; i++) {
+            var label = new Label();
+            label.text = "Tab " + i;
+            var tabEntry = new TabViewItem();
+            tabEntry.title = "Tab " + i;
+            tabEntry.view = label;
+
+            items.push(tabEntry);
+        }
+
+        return items;
+    }
+
+    const tabViewShownModallyEventHandler = function(args: ShownModallyData) {
+        args.closeCallback("return value");
+    }
+
+    const hostNavigatedToEventHandler = function(args) {
+        const page = <Page>args.object;
+        page.off(Page.navigatedToEvent, hostNavigatedToEventHandler);
+
+        const tabView = new TabView();
+        tabView.items = createTabItems(2);
+        tabView.on(View.shownModallyEvent, tabViewShownModallyEventHandler);
+
+        page.showModal(tabView, {}, modalCloseCallback, false, false);
+    }
+
+    const masterPageFactory = function(): Page {
+        const masterPage = new Page();
+        masterPage.id = "masterPage_test_WhenRootTabViewShownModallyItCanCloseModal";
+        masterPage.on(Page.navigatedToEvent, hostNavigatedToEventHandler);
+
+        const label = new Label();
+        label.text = "Text";
+        masterPage.content = label;
+        return masterPage;
+    };
+
+    helper.navigate(masterPageFactory);
+
+    TKUnit.waitUntilReady(() => modalClosed);
+}
+
 export function test_WhenPageIsNavigatedToItCanShowAnotherPageAsModal() {
     // if (platform.device.os === platform.platformNames.android
     //     && android.os.Build.VERSION.SDK_INT === android.os.Build.VERSION_CODES.JELLY_BEAN_MR1

tests/app/ui/tab-view/tab-view-tests.ts

@@ -2,9 +2,9 @@ import { UITest } from "../../ui-test";
 import { Label } from "tns-core-modules/ui/label";
 import { StackLayout } from "tns-core-modules/ui/layouts/stack-layout";
 import { unsetValue } from "tns-core-modules/ui/core/view";
-import TKUnit = require("../../TKUnit");
+import * as TKUnit from "../../TKUnit";
-import helper = require("../helper");
+import * as helper from "../helper";
-import tabViewTestsNative = require("./tab-view-tests-native");
+import * as tabViewTestsNative from "./tab-view-tests-native";
 
 // Using a TabView requires the "ui/tab-view" module.
 // >> article-require-tabview-module

tns-core-modules/ui/core/view/view.android.ts

@@ -175,15 +175,7 @@ function initializeDialogFragment() {
 
             this._shownCallback();
         }
-
+        
-        public onStop(): void {
-            super.onStop();
-            const owner = this.owner;
-            if (owner.isLoaded) {
-                owner.callUnloaded();
-            }
-        }
-
         public onDismiss(dialog: android.content.IDialogInterface): void {
             super.onDismiss(dialog);
             const manager = this.getFragmentManager();
@@ -191,6 +183,11 @@ function initializeDialogFragment() {
                 removeModal(this.owner._domId);
                 this._dismissCallback();
             }
+
+            const owner = this.owner;
+            if (owner.isLoaded) {
+                owner.callUnloaded();
+            }
         }
 
         public onDestroy(): void {

tns-core-modules/ui/tab-view/tab-view.android.ts

@@ -461,6 +461,10 @@ export class TabView extends TabViewBase {
     }
 
     private shouldUpdateAdapter(items: Array<TabViewItemDefinition>) {
+        if (!this._pagerAdapter) {
+            return false;
+        }
+        
         const currentPagerAdapterItems = (<any>this._pagerAdapter).items;
 
         // if both values are null, should not update