Window mode can be changed mid-game, fixed "apply" button not becoming active in the settings menu when changing the window mode

Barotrauma/BarotraumaClient/Source/GameSettings.cs

@@ -90,7 +90,12 @@ namespace Barotrauma
 
             displayModeDD.SelectItem(GameMain.Config.WindowMode);
 
-            displayModeDD.OnSelected = (guiComponent, obj) => { GameMain.Config.WindowMode = (WindowMode)guiComponent.UserData; return true; };
+            displayModeDD.OnSelected = (guiComponent, obj) => 
+            {
+                UnsavedSettings = true;
+                GameMain.Config.WindowMode = (WindowMode)guiComponent.UserData;
+                return true;
+            };
 
             y += 70;
 
@@ -130,7 +135,6 @@ namespace Barotrauma
             foreach (ContentPackage contentPackage in ContentPackage.list)
             {
                 contentPackageDD.AddItem(contentPackage.Name, contentPackage);
-
                 if (SelectedContentPackage == contentPackage) contentPackageDD.SelectItem(contentPackage);
             }
 
@@ -237,6 +241,11 @@ namespace Barotrauma
             Save("config.xml");
 
             settingsFrame.Flash(Color.Green);
+            
+            if (GameMain.WindowMode != GameMain.Config.WindowMode)
+            {
+                GameMain.Instance.SetWindowMode(GameMain.Config.WindowMode);
+            }
 
             if (GameMain.GraphicsWidth != GameMain.Config.GraphicsWidth || GameMain.GraphicsHeight != GameMain.Config.GraphicsHeight)
             {