fix edits changing message order

- was caused by the edited event timestamp replacing the original message, which in turn caused the message to be ordered as the latest message

matrix/services/sync/src/main/kotlin/app/dapk/st/matrix/sync/internal/sync/RoomEventCreator.kt

@@ -152,7 +152,6 @@ internal class TimelineEventMapper(
 
     private fun RoomEvent.Message.edited(edit: ApiTimelineEvent.TimelineMessage) = this.copy(
         content = richMessageParser.parse(edit.asTextContent().let { it.formattedBody ?: it.body }?.removePrefix(" * ") ?: "redacted"),
-        utcTimestamp = edit.utcTimestamp,
         edited = true,
     )
 

matrix/services/sync/src/test/kotlin/app/dapk/st/matrix/sync/internal/sync/RoomEventCreatorTest.kt

@@ -146,7 +146,7 @@ internal class RoomEventCreatorTest {
 
         result shouldBeEqualTo aMatrixRoomMessageEvent(
             eventId = originalMessage.eventId,
-            utcTimestamp = editedMessage.utcTimestamp,
+            utcTimestamp = originalMessage.utcTimestamp,
             content = A_TEXT_EVENT_MESSAGE,
             author = A_SENDER,
             edited = true
@@ -166,7 +166,7 @@ internal class RoomEventCreatorTest {
             replyingTo = originalMessage.replyingTo,
             message = aMatrixRoomMessageEvent(
                 eventId = originalMessage.eventId,
-                utcTimestamp = editedMessage.utcTimestamp,
+                utcTimestamp = originalMessage.utcTimestamp,
                 content = A_TEXT_EVENT_MESSAGE,
                 author = A_SENDER,
                 edited = true