Fix DockWindow.IsDocked to ignore single tab floating window as docked

Source/Editor/GUI/Docking/DockWindow.cs

@@ -50,7 +50,7 @@ namespace FlaxEditor.GUI.Docking
         /// <summary>
         /// Gets a value indicating whether this window is docked.
         /// </summary>
-        public bool IsDocked => _dockedTo != null;
+        public bool IsDocked => _dockedTo != null && _dockedTo.TabsCount > 1;
 
         /// <summary>
         /// Gets a value indicating whether this window is selected.

Source/Editor/Windows/GameWindow.cs

@@ -913,7 +913,7 @@ namespace FlaxEditor.Windows
         /// </summary>
         public void FocusGameViewport()
         {
-            if (!IsDocked)
+            if (ParentDockPanel == null)
             {
                 ShowFloating();
             }
@@ -1018,7 +1018,7 @@ namespace FlaxEditor.Windows
                     Screen.CursorVisible = true;
                 Screen.CursorLock = CursorLockMode.None;
 
-                if (Editor.IsPlayMode && IsDocked && IsSelected && RootWindow.FocusedControl == null)
+                if (Editor.IsPlayMode && ParentDockPanel != null && IsSelected && RootWindow.FocusedControl == null)
                 {
                     // Game UI cleared focus so regain it to maintain UI navigation just like game window does
                     FlaxEngine.Scripting.InvokeOnUpdate(Focus);