call SDL_UpdateHWnd

stepmania/src/RageDisplay_D3D.cpp

@@ -572,6 +572,9 @@ CString RageDisplay_D3D::TryVideoMode( VideoModeParams p, bool &bNewDeviceOut )
 #endif
 	}
 
+	/* Recreating the window changes the hwnd. */
+	SDL_UpdateHWnd();
+
 	ResolutionChanged();
 
 	this->SetDefaultRenderStates();

stepmania/src/arch/LowLevelWindow/LowLevelWindow_SDL.cpp

@@ -169,6 +169,9 @@ CString LowLevelWindow_SDL::TryVideoMode( RageDisplay::VideoModeParams p, bool &
 //	mySDL_EventState(SDL_OPENGLRESET, SDL_IGNORE);
 #endif
 
+	/* Recreating the window changes the hwnd. */
+	SDL_UpdateHWnd();
+
 	{
 		/* Find out what we really got. */
 		int r,g,b,a, colorbits, depth, stencil;