SDL: avoid UB (left shift of negative number) in SDL_windowsevents.c (74b3b)

SDL Commits
1 
From 74b3b8e9e30ba7f6c298dd420722dae64afa529e Mon Sep 17 00:00:00 2001
From: rohlem <[EMAIL REDACTED]>
Date: Mon, 10 Mar 2025 16:23:06 +0100
Subject: [PATCH] avoid UB (left shift of negative number) in
 SDL_windowsevents.c

(cherry picked from commit f1d16e9b4dcc8bfac5fe13b22b16d6552b1fcf79)
---
 src/video/windows/SDL_windowsevents.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/video/windows/SDL_windowsevents.c b/src/video/windows/SDL_windowsevents.c
index f271db85b828e..94997c151bc69 100644
--- a/src/video/windows/SDL_windowsevents.c
+++ b/src/video/windows/SDL_windowsevents.c
@@ -1640,7 +1640,7 @@ LRESULT CALLBACK WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lPara
             POINT cursorPos;
             GetCursorPos(&cursorPos);
             ScreenToClient(hwnd, &cursorPos);
-            PostMessage(hwnd, WM_MOUSEMOVE, 0, cursorPos.x | cursorPos.y << 16);
+            PostMessage(hwnd, WM_MOUSEMOVE, 0, cursorPos.x | (((unsigned int)((short)cursorPos.y)) << 16));
         }
     } break;