add resizeable bool

inc/main.h

@@ -128,6 +128,7 @@ typedef struct IDirectDrawImpl
     BOOL altenter;
     BOOL hidecursor;
     BOOL accurateTimers;
+    BOOL resizable;
     BOOL bnetActive;
     BOOL bnetWasFullscreen;
     SpeedLimiter ticksLimiter;

src/main.c

@@ -1016,10 +1016,31 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
         case WM_NCLBUTTONUP:
         case WM_NCACTIVATE:
         case WM_NCPAINT:
-        case WM_NCHITTEST:
         {
             return DefWindowProc(hWnd, uMsg, wParam, lParam);
         }
+        case WM_NCHITTEST:
+        {
+            LRESULT result = DefWindowProc(hWnd, uMsg, wParam, lParam);
+
+            if (!ddraw->resizable)
+            {
+                switch (result)
+                {
+                    case HTBOTTOM:
+                    case HTBOTTOMLEFT:
+                    case HTBOTTOMRIGHT:
+                    case HTLEFT:
+                    case HTRIGHT:
+                    case HTTOP:
+                    case HTTOPLEFT:
+                    case HTTOPRIGHT:
+                        return HTBORDER;
+                }
+            }
+
+            return result;
+        }
         case WM_SETCURSOR:
         {
             // show resize cursor on window borders

src/settings.c

@@ -42,6 +42,7 @@ void Settings_Load()
     ddraw->noactivateapp = GetBool("noactivateapp", FALSE);
     ddraw->vhack = GetBool("vhack", FALSE);
     ddraw->accurateTimers = GetBool("accuratetimers", FALSE);
+    ddraw->resizable = GetBool("resizable", TRUE);
 
     WindowRect.right = GetInt("width", 0);
     WindowRect.bottom = GetInt("height", 0);