bug: autofocus input causes modal animation be incorrect on ios

[msigwart]

Bug Report

Ionic version:

[x] 4.x

Current behavior:

The same issue as reported in #16136: When setting autofocus on an ion-input element in a modal in ios, the modal content disappears.

Expected behavior:

The modal content does not disappear.

Steps to reproduce:

1. Create an Ionic App
2. Create a Modal with const modal = await this.modalController.create({...
3. Set autofocus on an ion-input element in the modal component

Related code:

modal.component.html:

<ion-header>
  <ion-toolbar>
    <ion-title>Some Modal Component</ion-title>
  </ion-toolbar>
</ion-header>
<ion-content padding>
  <ion-item>
    <ion-label position="floating">Some Input</ion-label>
    <ion-input type="text" autofocus></ion-input>
  </ion-item>
</ion-content>

Other information:

Related issue: #16136

Ionic info:

Ionic:

   ionic (Ionic CLI)             : 4.12.0
   Ionic Framework               : @ionic/angular 4.4.0
   @angular-devkit/build-angular : 0.13.8
   @angular-devkit/schematics    : 7.3.8
   @angular/cli                  : 7.3.8
   @ionic/angular-toolkit        : 1.5.1

Cordova:

   cordova (Cordova CLI) : 8.1.2 ([email protected])
   Cordova Platforms     : android 7.1.4, ios 4.5.5
   Cordova Plugins       : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 4.0.1, (and 4 other plugins)

System:

   Android SDK Tools : 26.1.1
   NodeJS            : v11.9.0
   npm               : 6.9.0
   OS                : macOS Mojave
   Xcode             : Xcode 10.2.1 Build version 10E1001