when click mat-select input focus another input

#### Reproduction

Hi guys. I use ionic 4 and integrated angular material into my projects. Everything work perfectly but when I want to create the custom select component with search input I seem this issue. When open mat-select and click search input application focused another input. I don't solve this problem. I don't know maybe it's a bug. I upload *.gif file for more detail.

#### My Codes

```

```

Custom **mat-select** component:
```

{{label | translate}}

#### Screen


#### My Packages
```

`"@angular/animations": "8.2.14",
"@angular/cdk": "8.2.3",
"@angular/common": "8.2.14",
"@angular/core": "8.2.14",
"@angular/forms": "8.2.14",
"@angular/material": "8.2.3",
"@angular/platform-browser": "8.2.14",
"@angular/platform-browser-dynamic": "8.2.14",
"@angular/router": "8.2.14",
"@ionic-native/core": "5.17.1",
"@ionic-native/file": "5.17.1",
"@ionic-native/file-opener": "5.17.1",
"@ionic-native/file-transfer": "5.17.1",
"@ionic-native/in-app-browser": "^5.18.0",
"@ionic-native/keyboard": "^5.19.0",
"@ionic-native/network": "^5.18.0",
"@ionic-native/onesignal": "^5.18.0",
"@ionic-native/splash-screen": "5.17.1",
"@ionic-native/status-bar": "5.17.1",
"@ionic/angular": "4.11.5",
"@ionic/storage": "^2.2.0",`

```

Start by reproducing the behavior with the custom mat-select template and form markup shown in the issue, focusing on the embedded search input and the other form input. Trace mat-select focus handling during opening and input clicks; done means the search input receives focus without moving focus to another input, with the reproduction verified against the listed Angular Material versions.

Written by the indexing model from the issue text.