Question Difficulties with creating a modal editor window without extra large height

I was creating a modal popup window with a small canvas:

However, when I instantiated it via:

window.ShowModalUtility();

It would expand super tall:



In order to resolve this, I had to add a wrapper visual element inside of my UXML file and query it first. This seems.... weird to me.

Code (CSharp):

1.             TimelineEditorModalWindow window = ScriptableObject.CreateInstance(typeof(TimelineEditorModalWindow)) as TimelineEditorModalWindow;
2.             window.PreloadGUI();
3.            
4.             var rootWrapper = window.rootVisualElement.Q<VisualElement>("rootWrapper");
5.             window.position = window.position.CenterInsideOf(m_parentContainer.RootWindow.position).WithHeight(rootWrapper.resolvedStyle.height);
6.  
7.  
8. public static Rect CenterInsideOf( this Rect source, Rect target )
9. {
10.     var y = target.y + (target.height - source.height) / 2;
11.     var x = target.x + (target.width - source.width) / 2;
12.     return new Rect( x, y, source.width, source.height );
13. }
14.  
15. public static Rect WithHeight( this Rect source, float height )
16. {
17.     return new Rect( source.x, source.y, source.width, height );
18. }
19.