<!-- a fake input bound to nothing, for the sake of UI consistency -->
<mat-form-field>
    <input matInput disabled class="form-control" type="text"
        [id]="inputId" [name]="inputId" [ngModel]="infoText" [placeholder]="param.title">
    <button type="button" mat-icon-button class="param-values-more" (click)="openDialog()">
        <mat-icon>more_horiz</mat-icon>
    </button>
</mat-form-field>