editor window change size while docked?

so the basics of what I want to do, is enlarge a docking are, when the mouse is over it.

I already managed to hook into the OnSceneGUI of the scene View, but when change the size of the scene view, it is automatically undocked.
is there a way to change the size of a window, while keeping it docked? I was not able to find any code documentation relating to the docking areas of the unity editor at all.

current code:

Code (CSharp):

1.  
2. public static class SceneViewExtension
3. {
4.  
5.     [InitializeOnLoadMethod]
6.     private static void Init()
7.     {
8.         SceneView.duringSceneGui += OnSceneGUI;
9.         EditorApplication.update += Update;
10.     }
11.     static void OnSceneGUI(SceneView sceneView)
12.     {
13.         Event e = Event.current;
14.         if (e.type == EventType.MouseMove)
15.         {
16.             //enlarge the scene view when the mouse is over it
17.             Vector2 mpos = GUIUtility.GUIToScreenPoint(e.mousePosition);
18.             //Debug.Log(mpos);
19.             Rect curPos = sceneView.position;
20.             Rect newPos = new Rect(300, curPos.y, curPos.width, curPos.height);
21.             sceneView.position = newPos; //this will undock the window :|
22.             //EditorWindow.GetWindow<SceneView>().docked = true; //this is read only
23.             bool mouseOverSceneView = EditorWindow.mouseOverWindow == sceneView;
24.         } else if(e.type == EventType.KeyDown)
25.         {
26.             Debug.Log(e.keyCode);
27.             if(e.keyCode == KeyCode.Space)
28.                 sceneView.maximized = !sceneView.maximized;
29.         }
30.     }
31.     static void Update()
32.     {
33.  
34.     }
35. }