Synapse 1.20.0rc5 (2020-09-18)

==============================
 
 In addition to the below, Synapse 1.20.0rc5 also includes the bug fix that was included in 1.19.3.
 
 Features
 --------
 
 - Add flags to the `/versions` endpoint for whether new rooms default to using E2EE. ([\#8343](https://github.com/matrix-org/synapse/issues/8343))
 
 Bugfixes
 --------
 
 - Fix rate limiting of federation `/send` requests. ([\#8342](https://github.com/matrix-org/synapse/issues/8342))
 - Fix a longstanding bug where back pagination over federation could get stuck if it failed to handle a received event. ([\#8349](https://github.com/matrix-org/synapse/issues/8349))
 
 Internal Changes
 ----------------
 
 - Blacklist [MSC2753](https://github.com/matrix-org/matrix-doc/pull/2753) SyTests until it is implemented. ([\#8285](https://github.com/matrix-org/synapse/issues/8285))
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Merge tag 'v1.20.0rc5' into develop

Synapse 1.20.0rc5 (2020-09-18)
==============================

In addition to the below, Synapse 1.20.0rc5 also includes the bug fix that was included in 1.19.3.

Features
--------

- Add flags to the `/versions` endpoint for whether new rooms default to using E2EE. ([\#8343](https://github.com/matrix-org/synapse/issues/8343))

Bugfixes
--------

- Fix rate limiting of federation `/send` requests. ([\#8342](https://github.com/matrix-org/synapse/issues/8342))
- Fix a longstanding bug where back pagination over federation could get stuck if it failed to handle a received event. ([\#8349](https://github.com/matrix-org/synapse/issues/8349))

Internal Changes
----------------

- Blacklist [MSC2753](https://github.com/matrix-org/matrix-doc/pull/2753) SyTests until it is implemented. ([\#8285](https://github.com/matrix-org/synapse/issues/8285))

synapse/handlers/pagination.py

@@ -358,9 +358,9 @@ class PaginationHandler:
                 # if we're going backwards, we might need to backfill. This
                 # requires that we have a topo token.
                 if room_token.topological:
-                    max_topo = room_token.topological
+                    curr_topo = room_token.topological
                 else:
-                    max_topo = await self.store.get_max_topological_token(
+                    curr_topo = await self.store.get_current_topological_token(
                         room_id, room_token.stream
                     )
 
@@ -379,13 +379,13 @@ class PaginationHandler:
                     leave_token = RoomStreamToken.parse(leave_token_str)
                     assert leave_token.topological is not None
 
-                    if leave_token.topological < max_topo:
+                    if leave_token.topological < curr_topo:
                         from_token = from_token.copy_and_replace(
                             "room_key", leave_token
                         )
 
                 await self.hs.get_handlers().federation_handler.maybe_backfill(
-                    room_id, max_topo
+                    room_id, curr_topo, limit=source_config.limit,
                 )
 
             to_room_key = None