bug(angular, ios): routerDirection is reversed, when tapping current tab on root page of the tab

[imnskh]

Bug Report

Ionic version:

4.11.1

Current behavior:
If you tap the current tab on the root page of the tab, the page transition other than the routerLink directive will reverse routerDirection on iOS.

Expected behavior:
No matter how many times you tap the tab, it should become the appropriate routerDirection.

Steps to reproduce:

1. enable iOS mode
2. go to /tabs/tab1 page
3. tap button Tab One
4. tap link navigateByUrl Page1

https://stackblitz.com/edit/ionic-v4-angular-tabs-mv5vvs

Other information:

Is routerDirection rewritten when the current tab is tapped even if page transition does not occur?

https://github.com/ionic-team/ionic/blob/master/core/src/components/tab-button/tab-button.tsx#L92-L96
https://github.com/ionic-team/ionic/blob/master/angular/src/directives/navigation/ion-tabs.ts#L79

Ionic info:

Ionic:

   Ionic CLI                     : 5.4.1 (/Users/imnskh/.anyenv/envs/nodenv/versions/10.16.0/lib/node_modules/ionic)
   Ionic Framework               : @ionic/angular 4.11.1
   @angular-devkit/build-angular : 0.803.9
   @angular-devkit/schematics    : 8.3.9
   @angular/cli                  : 8.3.9
   @ionic/angular-toolkit        : 2.0.0

Cordova:

   Cordova CLI       : 9.0.0 (cordova-lib@9.0.1)
   Cordova Platforms : ios 5.0.1
   Cordova Plugins   : cordova-plugin-ionic-keyboard 2.2.0, cordova-plugin-ionic-webview 3.1.2, (and 23 other plugins)

Utility:

   cordova-res : not installed
   native-run  : not installed

System:

   ios-deploy : 1.9.4
   ios-sim    : 8.0.2
   NodeJS     : v10.16.0 (/Users/imnskh/.anyenv/envs/nodenv/versions/10.16.0/bin/node)
   npm        : 6.12.0
   OS         : macOS Mojave
   Xcode      : Xcode 11.1 Build version 11A1027

[imnskh]

it's already locked but probably the same problem #16917

[moritzvieli]

Also stumbled across this one. Yes, seems to be related to #169917. You can easily reproduce it, by simple tapping on the active tab, when it's already active. Using [routerLink] solves it as a workaround.

[oOntheway]

@imnskh Use navigateForward can solve it.

...
import { NavController } from '@ionic/angular';
...
constructor(private nav: NavController)
...
this.nav.navigateForward(...)
...