Question Why do GL calls draw on the whole window when my IMGUIContainer is inside a TwoPaneSplitView?

Hello!

I'm trying to draw a rectangle with GL inside of a TwoPanelSplitView, but my window ends up completely black when I use GL.Clear, rather than just the area inside the panel. What am I doing wrong?

Thanks!

Code for reference:

Code (CSharp):

1.         private void HandleDrawing()
2.         {
3.             if (Event.current.type is EventType.Repaint)
4.             {
5.                 _width = position.width;
6.                 _height = position.height;
7.                 _shader = Shader.Find("Hidden/Internal-Colored");
8.      
9.                 _mat = new Material(_shader)
10.                 {
11.                     hideFlags = HideFlags.HideAndDontSave
12.                 };
13.  
14.                 _mat.SetPass(0);
15.                 GL.PushMatrix();
16.      
17.                 GL.Clear(true, true, Color.black);
18.  
19.                 GL.PopMatrix();
20.                 Handles.EndGUI();
21.             }
22.         }
23.  
24.         private void Update()
25.         {
26.             Repaint();
27.         }
28.  
29.         public void CreateGUI()
30.         {
31.             // Each editor window contains a root VisualElement object
32.             VisualElement root = rootVisualElement;
33.          
34.             // Separate the window into variables and plot
35.             var splitView = new TwoPaneSplitView(0, 200, TwoPaneSplitViewOrientation.Horizontal);
36.             splitView.usageHints = UsageHints.GroupTransform;
37.             root.Add(splitView);
38.          
39.             // Panels from the splitview
40.             var leftPane = new VisualElement();
41.             splitView.Add(leftPane);
42.             var rightPane = new VisualElement();
43.             rightPane.usageHints = UsageHints.GroupTransform;
44.             splitView.Add(rightPane);
45.          
46.             // Add a GameObject to expose possible variables
47.             var gameObjectField = new ObjectField("Object to analyze");
48.             leftPane.Add(gameObjectField);
49.  
50.             var glContent = new IMGUIContainer(HandleDrawing);
51.             glContent.usageHints = UsageHints.DynamicColor;
52.          
53.             rightPane.Add(glContent);
54.         }

 

Nevermind, I could solve this by drawing a rectangle with Vertexes instead of Using GL.Clear