chore: add transactionId getter to Event class

lib/src/database/matrix_sdk_database.dart

@@ -1155,8 +1155,7 @@ class MatrixSdkDatabase extends DatabaseApi with DatabaseFileStorage {
 
       final eventId = timelineEvent.eventId;
       // In case this event has sent from this account we have a transaction ID
-      final transactionId =
-          timelineEvent.unsigned?.tryGet<String>('transaction_id');
+      final transactionId = timelineEvent.transactionId;
       await _eventsBox.put(
         TupleKey(roomId, eventId).toString(),
         timelineEvent.toJson(),

lib/src/event.dart

@@ -78,6 +78,8 @@ class Event extends MatrixEvent {
 
   MatrixEvent? get originalSource => _originalSource;
 
+  String? get transactionId => unsigned?.tryGet<String>('transaction_id');
+
   Event({
     this.status = defaultStatus,
     required Map<String, dynamic> super.content,
@@ -439,10 +441,9 @@ class Event extends MatrixEvent {
       final inReplyTo = credentials.inReplyTo == null
           ? null
           : await room.getEventById(credentials.inReplyTo!);
-      txid ??= unsigned?.tryGet<String>('transaction_id');
       return await room.sendFileEvent(
         file,
-        txid: txid,
+        txid: txid ?? transactionId,
         thumbnail: thumbnail,
         inReplyTo: inReplyTo,
         editEventId: credentials.editEventId,
@@ -455,7 +456,7 @@ class Event extends MatrixEvent {
     // in the `sendEvent` method to transition -1 -> 0 -> 1 -> 2
     return await room.sendEvent(
       content,
-      txid: txid ?? unsigned?.tryGet<String>('transaction_id') ?? eventId,
+      txid: txid ?? transactionId ?? eventId,
     );
   }
 
@@ -967,7 +968,7 @@ class Event extends MatrixEvent {
     if (eventId == search) {
       return true;
     }
-    return unsigned?['transaction_id'] == search;
+    return transactionId == search;
   }
 
   /// Get the relationship type of an event. `null` if there is none

lib/src/timeline.dart

@@ -473,7 +473,7 @@ class Timeline {
     for (i = 0; i < events.length; i++) {
       final searchHaystack = <String>{events[i].eventId};
 
-      final txnid = events[i].unsigned?.tryGet<String>('transaction_id');
+      final txnid = events[i].transactionId;
       if (txnid != null) {
         searchHaystack.add(txnid);
       }
@@ -489,9 +489,7 @@ class Timeline {
       (e) =>
           e.matchesEventOrTransactionId(event.eventId) ||
           event.unsigned != null &&
-              e.matchesEventOrTransactionId(
-                event.unsigned?.tryGet<String>('transaction_id'),
-              ),
+              e.matchesEventOrTransactionId(event.transactionId),
     );
   }
 
@@ -516,8 +514,8 @@ class Timeline {
 
   void removeAggregatedEvent(Event event) {
     aggregatedEvents.remove(event.eventId);
-    if (event.unsigned != null) {
-      aggregatedEvents.remove(event.unsigned?['transaction_id']);
+    if (event.transactionId != null) {
+      aggregatedEvents.remove(event.transactionId);
     }
     for (final types in aggregatedEvents.values) {
       for (final events in types.values) {
@@ -548,7 +546,7 @@ class Timeline {
 
       final i = _findEvent(
         event_id: event.eventId,
-        unsigned_txid: event.unsigned?.tryGet<String>('transaction_id'),
+        unsigned_txid: event.transactionId,
       );
 
       if (i < events.length) {