[lexical-react] Bug Fix: checklist cannot be toggled in sub-editors (#…

…6216)

Co-authored-by: sahejkm <sahejk@meta.com>

packages/lexical-react/src/LexicalCheckListPlugin.tsx

@@ -215,13 +215,15 @@ function handleClick(event: Event) {
       });
     }
   });
+  event.stopPropagation(); // Prevents potential parent-editor listeners from firing, causing the checkbox toggle to be undone
 }
 
 function handlePointerDown(event: PointerEvent) {
   handleCheckItemEvent(event, () => {
     // Prevents caret moving when clicking on check mark
     event.preventDefault();
   });
+  event.stopPropagation();
 }
 
 function findEditor(target: Node) {