From 05957ac70f5d634eafbea61bd79a9a89196507c2 Mon Sep 17 00:00:00 2001
From: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
Date: Thu, 4 Apr 2024 12:47:59 +0100
Subject: Fix bug in `/sync` response for archived rooms (#16932)

This PR fixes a very, very niche edge-case, but I've got some more work
coming which will otherwise make the problem worse.

The bug happens when the syncing user leaves a room, and has a sync
filter which includes "left" rooms, but sets the timeline limit to 0. In
that case, the state returned in the `state` section is calculated
incorrectly.

The fix is to pass a token corresponding to the point that the user
leaves the room through to `compute_state_delta`.
---
 changelog.d/16932.bugfix | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 changelog.d/16932.bugfix

(limited to 'changelog.d/16932.bugfix')

diff --git a/changelog.d/16932.bugfix b/changelog.d/16932.bugfix
new file mode 100644
index 0000000000..624388ea8e
--- /dev/null
+++ b/changelog.d/16932.bugfix
@@ -0,0 +1 @@
+Fix a long-standing bug which could cause incorrect state to be returned from `/sync` for rooms where the user has left.
\ No newline at end of file
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