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/GameMain.cs

@@ -74,6 +74,12 @@ namespace Barotrauma
             private set;
         }
         
+        public static WindowMode WindowMode
+        {
+            get;
+            private set;
+        }
+
         public static int GraphicsWidth
         {
             get;
@@ -155,7 +161,7 @@ namespace Barotrauma
             GraphicsDeviceManager.PreferMultiSampling = false;
             GraphicsDeviceManager.SynchronizeWithVerticalRetrace = Config.VSyncEnabled;
 
-            if (Config.WindowMode == WindowMode.Windowed)
+            if (Config.WindowMode == Barotrauma.WindowMode.Windowed)
             {
                 //for whatever reason, window isn't centered automatically
                 //since MonoGame 3.6 (nuget package might be broken), so
@@ -164,17 +170,23 @@ namespace Barotrauma
                                             (GraphicsAdapter.DefaultAdapter.CurrentDisplayMode.Height - GraphicsHeight) / 2);
             }
 
-            GraphicsDeviceManager.HardwareModeSwitch = Config.WindowMode != WindowMode.BorderlessWindowed;
-
-            GraphicsDeviceManager.IsFullScreen = Config.WindowMode == WindowMode.Fullscreen || Config.WindowMode == WindowMode.BorderlessWindowed;
             GraphicsDeviceManager.PreferredBackBufferWidth = GraphicsWidth;
             GraphicsDeviceManager.PreferredBackBufferHeight = GraphicsHeight;
 
-            GraphicsDeviceManager.ApplyChanges();
+            SetWindowMode(Config.WindowMode);
 
             defaultViewport = GraphicsDevice.Viewport;
         }
 
+        public void SetWindowMode(WindowMode windowMode)
+        {
+            WindowMode = windowMode;
+            GraphicsDeviceManager.HardwareModeSwitch = Config.WindowMode != WindowMode.BorderlessWindowed;
+            GraphicsDeviceManager.IsFullScreen = Config.WindowMode == WindowMode.Fullscreen || Config.WindowMode == WindowMode.BorderlessWindowed;
+            
+            GraphicsDeviceManager.ApplyChanges();
+        }
+
         public void ResetViewPort()
         {
             GraphicsDevice.Viewport = defaultViewport;