Template columns are not updating

[Kai Gerken]

I have a problem, that columns defined by template are not updating.

<gui-grid [source]="source">
  <ng-container *ngFor="let column of columns">
    <gui-grid-column [header]="column.header" [field]="column.field">
      <ng-template let-value="value">
        {{value}}
      </ng-template>
    </gui-grid-column>
  </ng-container>
</gui-grid>

On first start, its working. But if i change the variable columns, the grid don't update the internal config.

I've created a sample to reproduce the issue. To change the columns, you can click on the toggle button.
https://stackblitz.com/edit/angular-grid-quick-start-ue5cft?file=src/app/app.component.ts