GraphicsDeviceManager.ApplyChanges behavior not the same

[7aGiven]

For XNA: normal
For FNA: when resize window by mouse, it will be auto center.

Test case:

using Microsoft.Xna.Framework;
using System;

namespace ConsoleApp2
{
    public static class Program
    {
        [STAThread]
        private static void Main(string[] args)
        {
            using (FNAGame g = new FNAGame())
                g.Run();
        }
    }

    class FNAGame : Game
    {
        GraphicsDeviceManager gdm;
        internal FNAGame()
        {
            gdm = new GraphicsDeviceManager(this);
            Window.AllowUserResizing = true;
        }
        protected override void Draw(GameTime gameTime)
        {
            base.Draw(gameTime);
            if (gdm.PreferredBackBufferWidth != gdm.GraphicsDevice.Viewport.Width || gdm.PreferredBackBufferHeight != gdm.GraphicsDevice.Viewport.Height)
            {
                gdm.PreferredBackBufferWidth = GraphicsDevice.Viewport.Width - 1;
                gdm.PreferredBackBufferHeight = GraphicsDevice.Viewport.Height - 1;
                gdm.ApplyChanges();
            }
        }
    }
}

[7aGiven]

The game code: when the window size is odd, size & 0xFFFFFFFE becomes even.

            if (gdm.PreferredBackBufferWidth != gdm.GraphicsDevice.Viewport.Width || gdm.PreferredBackBufferHeight != gdm.GraphicsDevice.Viewport.Height)
            {
                gdm.PreferredBackBufferWidth = GraphicsDevice.Viewport.Width & 0x7FFFFFFE;
                gdm.PreferredBackBufferHeight = GraphicsDevice.Viewport.Height & 0x7FFFFFFE;
                gdm.ApplyChanges();
            }

[7aGiven]

I forget say: resize window by mouse.

[7aGiven]

I view the XNA. Don't center while between WM_ENTERSIZEMOVE and WM_EXITSIZEMOVE. But SDL3 seem not implement it.

My Mistake. Actual is that no longer center after resizing window by mouse once or moving window by mouse once.

[7aGiven]

I have done a workaround. But not cross platform.

		public static string ProgramInit(LaunchParameters args)
		{
			SDL.SDL_SetWindowsMessageHook(SDL_WindowsMessageHook, IntPtr.Zero);
		}
		static bool userMovedResized = false;
		static readonly SDL.SDL_WindowsMessageHook SDL_WindowsMessageHook = _SDL_WindowsMessageHook;
		static bool _SDL_WindowsMessageHook(IntPtr userdata, ref SDL.MSG msg)
		{
			if (msg.message == 0x231) // WM_ENTERSIZEMOVE
				userMovedResized = true;
			return true;
		}