refactor(ffi): add debug logging when a latest event is not a standalone content item

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

@@ -145,6 +145,20 @@ pub(super) enum HandleAggregationKind {
     PollEnd,
 }
 
+impl HandleAggregationKind {
+    /// Returns a small string describing this aggregation, for debug purposes.
+    pub fn debug_string(&self) -> &'static str {
+        match self {
+            HandleAggregationKind::Reaction { .. } => "a reaction",
+            HandleAggregationKind::Redaction => "a redaction",
+            HandleAggregationKind::Edit { .. } => "an edit",
+            HandleAggregationKind::PollResponse { .. } => "a poll response",
+            HandleAggregationKind::PollEdit { .. } => "a poll edit",
+            HandleAggregationKind::PollEnd => "a poll end",
+        }
+    }
+}
+
 /// An action that we want to cause on the timeline.
 #[derive(Clone, Debug)]
 #[allow(clippy::large_enum_variant)]

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

@@ -15,6 +15,7 @@
 use matrix_sdk::{Client, Room, latest_events::LocalLatestEventValue};
 use matrix_sdk_base::latest_event::LatestEventValue as BaseLatestEventValue;
 use ruma::{MilliSecondsSinceUnixEpoch, OwnedUserId};
+use tracing::trace;
 
 use crate::timeline::{
     Profile, TimelineDetails, TimelineItemContent, event_handler::TimelineAction,
@@ -121,6 +122,9 @@ impl LatestEventValue {
                     }
 
                     TimelineAction::HandleAggregation { kind, .. } => {
+                        // Add some debug logging here to help diagnose issues with the latest
+                        // event.
+                        trace!("latest event is an aggregation: {}", kind.debug_string());
                         Self::None
                     }
                 }