From 7852f31f7ea1819f9c7f2fe7ec5287663f75d88e Mon Sep 17 00:00:00 2001
From: Bruno Windels <brunow@matrix.org>
Date: Sun, 2 Jun 2019 19:28:24 +0200
Subject: [PATCH] clear token on pagination when events start overlapping

---
 src/matrix/room/timeline/persistence/GapWriter.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/matrix/room/timeline/persistence/GapWriter.js b/src/matrix/room/timeline/persistence/GapWriter.js
index ba25f909..dfef468e 100644
--- a/src/matrix/room/timeline/persistence/GapWriter.js
+++ b/src/matrix/room/timeline/persistence/GapWriter.js
@@ -64,14 +64,20 @@ export default class GapWriter {
         if (neighbourFragmentEntry) {
             fragmentEntry.linkedFragmentId = neighbourFragmentEntry.fragmentId;
             neighbourFragmentEntry.linkedFragmentId = fragmentEntry.fragmentId;
+            // if neighbourFragmentEntry was found, it means the events were overlapping,
+            // so no pagination should happen anymore.
+            neighbourFragmentEntry.token = null;
+            fragmentEntry.token = null;
+
             txn.timelineFragments.update(neighbourFragmentEntry.fragment);
             directionalAppend(entries, neighbourFragmentEntry, direction);
 
             // update fragmentIdComparer here after linking up fragments
             this._fragmentIdComparer.add(fragmentEntry.fragment);
             this._fragmentIdComparer.add(neighbourFragmentEntry.fragment);
+        } else {
+            fragmentEntry.token = end;
         }
-        fragmentEntry.token = end;
         txn.timelineFragments.update(fragmentEntry.fragment);
     }