From cabaede7fc374763adb46321e853bfe4b68075fe Mon Sep 17 00:00:00 2001
From: Mauro Romito <mauro.romito@element.io>
Date: Mon, 16 Mar 2026 16:46:27 +0100
Subject: [PATCH] feat: added beacon_info start event to the latest_event that
 can be displayed

---
 .../src/latest_events/latest_event/builder.rs | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/crates/matrix-sdk/src/latest_events/latest_event/builder.rs b/crates/matrix-sdk/src/latest_events/latest_event/builder.rs
index 67fb90d3e..43dc79d6e 100644
--- a/crates/matrix-sdk/src/latest_events/latest_event/builder.rs
+++ b/crates/matrix-sdk/src/latest_events/latest_event/builder.rs
@@ -786,6 +786,15 @@ fn filter_any_sync_state_event(
             }
         }
 
+        // `org.matrix.msc3672.beacon_info`
+        //
+        // Only the *start* event (`is_live() == true`) is suitable. The stop
+        // event (`is_live() == false`) merely terminates the sharing session
+        // and should not appear as the room's latest event.
+        AnySyncStateEvent::BeaconInfo(SyncStateEvent::Original(beacon)) => {
+            if beacon.content.is_live() { filter_break() } else { filter_continue() }
+        }
+
         _ => filter_continue(),
     }
 }
@@ -1281,6 +1290,38 @@ mod filter_tests {
         );
     }
 
+    #[test]
+    fn test_beacon_info_live() {
+        use std::time::Duration;
+
+        // A live beacon_info (start of location sharing) is a candidate.
+        assert_latest_event_content!(
+            event | event_factory | {
+                event_factory
+                    .beacon_info(None, Duration::from_secs(60), true, None)
+                    .state_key(user_id!("@mnt_io:matrix.org"))
+                    .into_event()
+            }
+            is a candidate
+        );
+    }
+
+    #[test]
+    fn test_beacon_info_stopped() {
+        use std::time::Duration;
+
+        // A non-live beacon_info (stop event) is NOT a candidate.
+        assert_latest_event_content!(
+            event | event_factory | {
+                event_factory
+                    .beacon_info(None, Duration::from_secs(60), false, None)
+                    .state_key(user_id!("@mnt_io:matrix.org"))
+                    .into_event()
+            }
+            is not a candidate
+        );
+    }
+
     #[test]
     fn test_room_message_verification_request() {
         use ruma::{OwnedDeviceId, events::room::message};