Adapt to cce-ui KeyEvent gaining the alt field (synthetic events: alt false)

Co-Authored-By: Claude Fable 5 <[email protected]>

 src/scroll_region.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/scroll_region.rs b/src/scroll_region.rs
index 9ae139d..d79a5a4 100644
--- a/src/scroll_region.rs
+++ b/src/scroll_region.rs
@@ -310,6 +310,7 @@ mod tests {
             repeat: false,
             ctrl: false,
             shift: false,
+            alt: false,
         };
         assert!(!r.keyboard(&down)); // neither hovered nor focused
         r.cursor_moved(50.0, 50.0);