Fix native window system regression on Windows in Editor due to transparent window as layered

#4039

Source/Editor/GUI/Docking/FloatWindowDockPanel.cs

@@ -135,7 +135,9 @@ namespace FlaxEditor.GUI.Docking
             settings.MaximumSize = Float2.Zero; // Unlimited size
             settings.Fullscreen = false;
             settings.HasBorder = true;
+#if !PLATFORM_WINDOWS // Transparency requires WS_EX_LAYERED on Windows which breaks window bounds
             settings.SupportsTransparency = true;
+#endif
             settings.ActivateWhenFirstShown = true;
             settings.AllowInput = true;
             settings.AllowMinimize = true;
@@ -150,6 +152,7 @@ namespace FlaxEditor.GUI.Docking
 
             if (Utilities.Utils.UseCustomWindowDecorations())
             {
+                settings.SupportsTransparency = true;
                 settings.HasBorder = false;
                 //settings.HasSizingFrame = false;
             }

Source/Editor/Modules/UIModule.cs

@@ -823,7 +823,7 @@ namespace FlaxEditor.Modules
                 driver = $" ({driver})";
 #endif
 
-            WindowDecorations = new MainWindowDecorations(mainWindow, !Utilities.Utils.UseCustomWindowDecorations(isMainWindow: true))
+            WindowDecorations = new MainWindowDecorations(mainWindow, !Utilities.Utils.UseCustomWindowDecorations(true))
             {
                 Parent = mainWindow,
                 IconTooltipText = $"{mainWindow.RootWindow.Title}\nVersion {Globals.EngineVersion}\nConfiguration {configuration}\nGraphics {GPUDevice.Instance.RendererType}{driver}",