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When using an "<ng-template>" for the header or footer of a dropdown list which contains a Syncfusion component and when a "popupHeight" other than "auto" has been set, the actual popup height will be calculated incorrectly.
Issue Demonstration: https://stackblitz.com/edit/angular-e5n4uv?file=app.component.html
This is probably caused by Syncfusion components being rendered on their "ngAfterViewInit" hook, which is too late because the DropDownList popup height is calculated before the Syncfusion components inside the template are rendered.