fix read receipts on edited and redacted events

app/src/main/java/com/dfsek/feldspar/util/TimelineEventWrapper.kt

@@ -41,6 +41,9 @@ interface TimelineEventWrapper {
         }
 
         override val canRedact = false
+
+        override val receiptEvent: TimelineEvent
+            get() = redactionEvent
     }
 
     class Replaced(override val event: TimelineEvent, val eventWrapper: TimelineEventWrapper, val replacedBy: TimelineEvent) : TimelineEventWrapper {
@@ -55,6 +58,9 @@ interface TimelineEventWrapper {
                 )
             }
         }
+
+        override val receiptEvent: TimelineEvent
+            get() = replacedBy
     }
 
     class Replied(override val event: TimelineEvent, val repliedTo: String) : TimelineEventWrapper {
@@ -96,6 +102,9 @@ interface TimelineEventWrapper {
 
     val event: TimelineEvent
 
+    val receiptEvent: TimelineEvent
+        get() = event
+
     @Composable
     fun RenderEvent(modifier: Modifier) {
         Column(modifier = modifier.fillMaxWidth()) {
@@ -119,7 +128,7 @@ interface TimelineEventWrapper {
     @Composable
     fun RenderReadReceipts(modifier: Modifier) {
         Row(modifier) {
-            event.readReceipts.forEach {
+            receiptEvent.readReceipts.forEach {
                 Avatar(it.roomMember.avatarUrl, 18, name = it.roomMember.displayName)
             }
         }