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md-error incorrect render when used with ngFor #5263

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@dimabutenko

Description

@dimabutenko

What is the expected behavior?

If I implement my component like this, it's behavior which I want

<md-input-container [formGroup]="formGroup">
                    <input mdInput [mdDatepicker]="datepicker" [formControlName]="control.name" [readOnly]="control.isReadonly"
                    [placeholder]="control.placeholder" [required]="control.isRequired">
                    <button *ngIf="!control.isReadonly" mdSuffix [mdDatepickerToggle]="datepicker"></button>
                    <md-error *ngIf="formGroup.controls[control.name].hasError('required')">Hello world</md-error>
                </md-input-container>
                <md-datepicker #datepicker></md-datepicker>

What is the current behavior?

Now I have array messages. And I have this implementation:

<md-input-container [formGroup]="formGroup">
                    <input mdInput [mdDatepicker]="datepicker" [formControlName]="control.name" [readOnly]="control.isReadonly"
                    [placeholder]="control.placeholder" [required]="control.isRequired">
                    <button *ngIf="!control.isReadonly" mdSuffix [mdDatepickerToggle]="datepicker"></button>
                    <ng-template ngFor let-errorMessage [ngForOf]="formGroup.controls[control.name].errorMessages">
                        <md-error *ngIf="formGroup.controls[control.name].hasError(errorMessage.type)">
                            {{ errorMessage.message }}
                        </md-error>
                    </ng-template>
                </md-input-container>
                <md-datepicker #datepicker></md-datepicker>

Maybe I use it incorrect. But i want to generate md-error automatically from array. I don't know what is this - new feature, bug or proposal. thanks

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