Determines the container sizing if the component needs to react. Component will get
allocatedHeight if the input is true..
If the parent context hosting the component provides a limit on the height in model-driven apps, the same is properly applied to the child component. However, in most scenarios,the parent context does not constrain the height of the component, and so it receives "-1" to indicate that it may grow further.
In canvas apps, the parent context always provides the height and width to the component by nature of the drag-and-drop editor.