message: Show loading placeholder while code snippet is retrieved
diff: [vulnLines]="snippet?.vulnLines"
  (addLine) = "addLine($event)">
  </app-code-area>
  + <pre *ngIf="snippet === null">
  + <code translate>LOADING_CODE_SNIPPET</code>
  + </pre>
  </div>
  </div>
  <mat-dialog-actions align="end" class="dialogAction">
  