Realm: fix remaining frozen result

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/timeline/SendingEventsDataSource.kt

@@ -46,7 +46,7 @@ internal class RealmSendingEventsDataSource(
 
     private val sendingTimelineEventsListener = RealmChangeListener<RealmList<TimelineEventEntity>> { events ->
         uiEchoManager.onSentEventsInDatabase(events.map { it.eventId })
-        frozenSendingTimelineEvents = sendingTimelineEvents?.freeze()
+        updateFrozenResults(events)
         onEventsUpdated(false)
     }
 
@@ -59,10 +59,17 @@ internal class RealmSendingEventsDataSource(
 
     override fun stop() {
         sendingTimelineEvents?.removeChangeListener(sendingTimelineEventsListener)
+        updateFrozenResults(null)
         sendingTimelineEvents = null
         roomEntity = null
     }
 
+    private fun updateFrozenResults(sendingEvents: RealmList<TimelineEventEntity>?) {
+        // Makes sure to close the previous frozen realm
+        frozenSendingTimelineEvents?.realm?.close()
+        frozenSendingTimelineEvents = sendingEvents?.freeze()
+    }
+
     override fun buildSendingEvents(): List<TimelineEvent> {
         val builtSendingEvents = mutableListOf<TimelineEvent>()
         uiEchoManager.getInMemorySendingEvents()