useMinExpanded property Null safety
If autoSizeExpanded is true and if you also want to take PanelSize.expandedHeight in the consideration, use this.
Whenever panel's size is calculated, panel will use the PanelSize.expandedHeight and autoSizeExpanded in the following manner. height = minimum of (PanelSize.expandedHeight, autoSizeExpanded).
Default : false
final bool useMinExpanded;