fix on_id widget refcount leak (-> memory leak)

src/util/refcount.rs

@@ -17,6 +17,9 @@ impl RefCounter {
         let refs = self.0.fetch_sub(1, Ordering::Release);
         refs == 0
     }
+    pub fn quiet_clone(&self) -> Self {
+        Self(self.0.clone())
+    }
 }
 
 impl Clone for RefCounter {