We don't need to pull scancode state to see if ALT is held down

src/video/windows/SDL_windowsevents.c

@@ -1239,12 +1239,11 @@ LRESULT CALLBACK WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lPara
         SDL_bool virtual_key = SDL_FALSE;
         Uint16 rawcode = 0;
         SDL_Scancode code = WindowsScanCodeToSDLScanCode(lParam, wParam, &rawcode, &virtual_key);
-        const Uint8 *keyboardState = SDL_GetKeyboardState(NULL);
 
         /* Detect relevant keyboard shortcuts */
-        if (keyboardState[SDL_SCANCODE_LALT] == SDL_PRESSED || keyboardState[SDL_SCANCODE_RALT] == SDL_PRESSED) {
+        if (code == SDL_SCANCODE_F4 && (SDL_GetModState() & SDL_KMOD_ALT)) {
             /* ALT+F4: Close window */
-            if (code == SDL_SCANCODE_F4 && ShouldGenerateWindowCloseOnAltF4()) {
+            if (ShouldGenerateWindowCloseOnAltF4()) {
                 SDL_SendWindowEvent(data->window, SDL_EVENT_WINDOW_CLOSE_REQUESTED, 0, 0);
             }
         }