From cdd36ce034df8b1c061bd5f78902fb5ac6a5bcb6 Mon Sep 17 00:00:00 2001
From: ariskotsomitopoulos <aris.kotsomitopoulos@gmail.com>
Date: Mon, 31 Jan 2022 11:56:26 +0200
Subject: [PATCH] Fix IndexOutOfBound crashes while clicking permalinks

---
 .../timeline/helper/TimelineControllerInterceptorHelper.kt   | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/helper/TimelineControllerInterceptorHelper.kt b/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/helper/TimelineControllerInterceptorHelper.kt
index 7165921b35..8a0e1e18fd 100644
--- a/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/helper/TimelineControllerInterceptorHelper.kt
+++ b/vector/src/main/java/im/vector/app/features/home/room/detail/timeline/helper/TimelineControllerInterceptorHelper.kt
@@ -115,7 +115,10 @@ class TimelineControllerInterceptorHelper(private val positionOfReadMarker: KMut
     private fun MutableList<EpoxyModel<*>>.addForwardPrefetchIfNeeded(timeline: Timeline?, callback: TimelineEventController.Callback?) {
         val shouldAddForwardPrefetch = timeline?.hasMoreToLoad(Timeline.Direction.FORWARDS) ?: false
         if (shouldAddForwardPrefetch) {
-            val indexOfPrefetchForward = DEFAULT_PREFETCH_THRESHOLD.coerceAtMost(size - 1)
+            val indexOfPrefetchForward = DEFAULT_PREFETCH_THRESHOLD
+                    .coerceAtMost(size - 1)
+                    .coerceAtLeast(0)
+
             val loadingItem = LoadingItem_()
                     .id("prefetch_forward_loading${System.currentTimeMillis()}")
                     .showLoader(false)