SDL: center cursor to client area (excludes titlebar thickness)

SDL Commits
1 
From a7326b9396662c1e248dd530f6985f24e0ea337e Mon Sep 17 00:00:00 2001
From: expikr <[EMAIL REDACTED]>
Date: Thu, 6 Jul 2023 00:58:09 +0800
Subject: [PATCH] center cursor to client area (excludes titlebar thickness)

---
 src/video/windows/SDL_windowswindow.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/video/windows/SDL_windowswindow.c b/src/video/windows/SDL_windowswindow.c
index fbfefe32452e..e42014f13f2c 100644
--- a/src/video/windows/SDL_windowswindow.c
+++ b/src/video/windows/SDL_windowswindow.c
@@ -1320,7 +1320,9 @@ void WIN_UpdateClipCursor(SDL_Window *window)
          (window->mouse_rect.w > 0 && window->mouse_rect.h > 0)) &&
         (window->flags & SDL_WINDOW_INPUT_FOCUS)) {
         if (mouse->relative_mode && !mouse->relative_mode_warp && data->mouse_relative_mode_center) {
-            if (GetWindowRect(data->hwnd, &rect)) {
+            if (GetClientRect(data->hwnd, &rect)) {             /*    RECT( left , top , right , bottom )   */
+                ClientToScreen(data->hwnd, (LPPOINT)&rect);     /*   POINT( left , top )                    */
+                ClientToScreen(data->hwnd, (LPPOINT)&rect + 1); /*                POINT( right , bottom )   */
                 /* WIN_WarpCursor() jitters by +1, and remote desktop warp wobble is +/- 1 */
                 LONG remote_desktop_adjustment = GetSystemMetrics(SM_REMOTESESSION) ? 2 : 0;
                 LONG cx, cy;