ui: Add logging for send-event cancellation

crates/matrix-sdk-ui/src/timeline/inner/mod.rs

@@ -578,8 +578,10 @@ impl<P: RoomDataProvider> TimelineInner<P> {
             rfind_event_item(&state.items, |it| it.transaction_id() == Some(txn_id))
         {
             state.items.remove(idx);
+            debug!("Discarded local echo");
             true
         } else {
+            debug!("Can't find local echo to discard");
             false
         }
     }

crates/matrix-sdk-ui/src/timeline/mod.rs

@@ -604,6 +604,7 @@ impl Timeline {
     ///   state of `SendState::NotYetSent` might be supported in the future as
     ///   well, but there can be no guarantee for that actually stopping the
     ///   event from reaching the server.
+    #[instrument(skip(self))]
     pub async fn cancel_send(&self, txn_id: &TransactionId) -> bool {
         self.inner.discard_local_echo(txn_id).await
     }