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-rw-r--r--synapse/events/utils.py21
1 files changed, 13 insertions, 8 deletions
diff --git a/synapse/events/utils.py b/synapse/events/utils.py
index 43c3241fb0..2174b4a094 100644
--- a/synapse/events/utils.py
+++ b/synapse/events/utils.py
@@ -402,6 +402,7 @@ class EventClientSerializer:
         *,
         config: SerializeEventConfig = _DEFAULT_SERIALIZE_EVENT_CONFIG,
         bundle_aggregations: Optional[Dict[str, "BundledAggregations"]] = None,
+        apply_edits: bool = True,
     ) -> JsonDict:
         """Serializes a single event.
 
@@ -409,10 +410,10 @@ class EventClientSerializer:
             event: The event being serialized.
             time_now: The current time in milliseconds
             config: Event serialization config
-            bundle_aggregations: Whether to include the bundled aggregations for this
-                event. Only applies to non-state events. (State events never include
-                bundled aggregations.)
-
+            bundle_aggregations: A map from event_id to the aggregations to be bundled
+               into the event.
+            apply_edits: Whether the content of the event should be modified to reflect
+               any replacement in `bundle_aggregations[<event_id>].replace`.
         Returns:
             The serialized event
         """
@@ -430,8 +431,9 @@ class EventClientSerializer:
                     event,
                     time_now,
                     config,
-                    bundle_aggregations[event.event_id],
+                    event_aggregations,
                     serialized_event,
+                    apply_edits=apply_edits,
                 )
 
         return serialized_event
@@ -470,6 +472,7 @@ class EventClientSerializer:
         config: SerializeEventConfig,
         aggregations: "BundledAggregations",
         serialized_event: JsonDict,
+        apply_edits: bool,
     ) -> None:
         """Potentially injects bundled aggregations into the unsigned portion of the serialized event.
 
@@ -479,7 +482,8 @@ class EventClientSerializer:
             aggregations: The bundled aggregation to serialize.
             serialized_event: The serialized event which may be modified.
             config: Event serialization config
-
+            apply_edits: Whether the content of the event should be modified to reflect
+               any replacement in `aggregations.replace`.
         """
         serialized_aggregations = {}
 
@@ -490,9 +494,10 @@ class EventClientSerializer:
             serialized_aggregations[RelationTypes.REFERENCE] = aggregations.references
 
         if aggregations.replace:
-            # If there is an edit, apply it to the event.
+            # If there is an edit, optionally apply it to the event.
             edit = aggregations.replace
-            self._apply_edit(event, serialized_event, edit)
+            if apply_edits:
+                self._apply_edit(event, serialized_event, edit)
 
             # Include information about it in the relations dict.
             serialized_aggregations[RelationTypes.REPLACE] = {