SDL: testclipboard: make the window resizable

SDL Commits
1 
From 9d3dd8f0018270fce92e55356e1b687ba20f40ba Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Fri, 10 Oct 2025 16:17:06 -0700
Subject: [PATCH] testclipboard: make the window resizable

This is handy to see multiple image formats on the clipboard
---
 test/testclipboard.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/testclipboard.c b/test/testclipboard.c
index 78c3432b2fce8..85924bbf8a38c 100644
--- a/test/testclipboard.c
+++ b/test/testclipboard.c
@@ -46,7 +46,7 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
         return SDL_APP_FAILURE;
     }
 
-    if (!SDL_CreateWindowAndRenderer("testclipboard", 640, 480, 0, &window, &renderer)) {
+    if (!SDL_CreateWindowAndRenderer("testclipboard", 640, 480, SDL_WINDOW_RESIZABLE, &window, &renderer)) {
         SDL_Log("Couldn't create window and renderer: %s", SDL_GetError());
         return SDL_APP_FAILURE;
     }