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Assets/Plugins/Fullscreen/Editor/KeepFullscreenBelow.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEditor;
+using UnityEngine;
+
+namespace FullscreenEditor {
+    internal static class KeepFullscreenBelow {
+        [InitializeOnLoadMethod]
+        private static void InitPatch() {
+            var eApp = typeof(EditorApplication);
+            var callback = eApp.GetFieldValue<EditorApplication.CallbackFunction>("windowsReordered");
+            callback += () => BringWindowsAbove();
+            eApp.SetFieldValue("windowsReordered", callback);
+            FullscreenCallbacks.afterFullscreenOpen += (f) => BringWindowsAbove();
+        }
+
+        // https://github.com/mukaschultze/fullscreen-editor/issues/54
+        // This is needed because ContainerWindows created by ShowAsDropDown are not
+        // returned by 'windows' property
+        public static IEnumerable<ScriptableObject> GetAllContainerWindowsOrdered() {
+            var ordered = Types.ContainerWindow
+                .GetPropertyValue<ScriptableObject[]>("windows")
+                .Reverse();
+
+            var missing = Resources
+                .FindObjectsOfTypeAll(Types.ContainerWindow)
+                .Select(cw => cw as ScriptableObject);
+
+            return ordered
+                .Concat(missing)
+                .Distinct();
+        }
+
+        public static void BringWindowsAbove() {
+
+            if (!FullscreenPreferences.KeepFullscreenBelow)
+                return;
+
+            var fullscreens = Fullscreen.GetAllFullscreen();
+            if (fullscreens.Length == 0)
+                return;
+
+            var methodName = "Internal_BringLiveAfterCreation";
+            var windows = GetAllContainerWindowsOrdered()
+                .Where(w => !Fullscreen.GetFullscreenFromView(w))
+                .Where(w => {
+                    if (w.GetPropertyValue<int>("showMode") == (int)ShowMode.MainWindow)
+                        return false; // Main Window should be kept below everything
+
+                    if (fullscreens.FirstOrDefault((f) => f.m_src.Container == w))
+                        return false; // Keep other fullscreen containers below
+
+                    return true;
+                });
+
+            foreach (var w in windows) {
+                if (w.HasMethod(methodName, new Type[] { typeof(bool), typeof(bool), typeof(bool) }))
+                    w.InvokeMethod(methodName, true, false, false);
+                else
+                    w.InvokeMethod(methodName, true, false);
+            }
+        }
+    }
+}