SDL: Return false from SDL_SetWindowMouseRect() if it's not supported

SDL Commits
1 
From 2a873be9cdb35972dc8bacd12653aafc02e835de Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Thu, 6 Nov 2025 11:59:47 -0800
Subject: [PATCH] Return false from SDL_SetWindowMouseRect() if it's not
 supported

---
 src/video/SDL_video.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/video/SDL_video.c b/src/video/SDL_video.c
index d363855446c50..ea1b634a42753 100644
--- a/src/video/SDL_video.c
+++ b/src/video/SDL_video.c
@@ -4052,6 +4052,10 @@ bool SDL_SetWindowMouseRect(SDL_Window *window, const SDL_Rect *rect)
 {
     CHECK_WINDOW_MAGIC(window, false);
 
+    if (!_this->SetWindowMouseRect) {
+        return SDL_Unsupported();
+    }
+
     SDL_Rect zero = { 0, 0, 0, 0 };
     if (!rect) {
         rect = &zero;
@@ -4062,10 +4066,7 @@ bool SDL_SetWindowMouseRect(SDL_Window *window, const SDL_Rect *rect)
     }
     SDL_memcpy(&window->mouse_rect, rect, sizeof(*rect));
 
-    if (_this->SetWindowMouseRect) {
-        return _this->SetWindowMouseRect(_this, window);
-    }
-    return true;
+    return _this->SetWindowMouseRect(_this, window);
 }
 
 const SDL_Rect *SDL_GetWindowMouseRect(SDL_Window *window)