Map all replyTo data and add preview for loading and erorr case.

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/timeline/item/event/InReplyTo.kt

@@ -26,7 +26,7 @@ sealed interface InReplyTo {
     data class NotLoaded(val eventId: EventId) : InReplyTo
 
     /** The event details are pending to be fetched. We should **not** fetch them again. */
-    data object Pending : InReplyTo
+    data class Pending(val eventId: EventId) : InReplyTo
 
     /** The event details are available. */
     data class Ready(
@@ -44,5 +44,8 @@ sealed interface InReplyTo {
      * If the reason for the failure is consistent on the server, we'd enter a loop
      * where we keep trying to fetch the same event.
      * */
-    data object Error : InReplyTo
+    data class Error(
+        val eventId: EventId,
+        val message: String,
+    ) : InReplyTo
 }

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/timeline/item/event/EventMessageMapper.kt

@@ -57,9 +57,16 @@ class EventMessageMapper {
                         senderProfile = event.senderProfile.map(),
                     )
                 }
-                is RepliedToEventDetails.Error -> InReplyTo.Error
-                is RepliedToEventDetails.Pending -> InReplyTo.Pending
-                is RepliedToEventDetails.Unavailable -> InReplyTo.NotLoaded(inReplyToId)
+                is RepliedToEventDetails.Error -> InReplyTo.Error(
+                    eventId = inReplyToId,
+                    message = event.message,
+                )
+                RepliedToEventDetails.Pending -> InReplyTo.Pending(
+                    eventId = inReplyToId,
+                )
+                is RepliedToEventDetails.Unavailable -> InReplyTo.NotLoaded(
+                    eventId = inReplyToId
+                )
             }
         }
         MessageContent(