Redact local echo: same text as redaction event

src/backend/matrix_client.py

@@ -876,27 +876,48 @@ class MatrixClient(nio.AsyncClient):
         return (successes, errors)
 
 
+    async def get_redacted_event_content(
+        self, m_type: str, redacter: str, sender: str, reason: str = "",
+    ) -> str:
+        kind = m_type.split(".")[-1].replace("_", " ")
+
+        if kind != "message":
+            kind = f"{kind} event"
+
+        content = f"%1 removed this {kind}" if redacter == sender else \
+                  f"%1's {kind} was removed by %2"
+
+        if reason:
+            content = f"{content}, reason: {reason}"
+
+        return content
+
+
     async def room_mass_redact(
         self, room_id: str, reason: str, *event_ids: str,
-    ) -> List[nio.responses.RoomRedactResponse]:
-        """Redact events from a room in parallel.
-
-        Returns a list of sucessful redacts.
-        """
+    ) -> List[nio.RoomRedactResponse]:
+        """Redact events from a room in parallel."""
 
         model = self.models[self.user_id, room_id, "events"]
-        gather_list = []
+        tasks = []
 
         for event in model._sorted_data:
+            m_type = event.source.source["type"]
+
             if event.event_id in event_ids:
                 event.is_local_echo = True
-                event.content       = "Removing..."
+
+                event.content = await self.get_redacted_event_content(
+                    m_type, self.user_id, event.sender_id, reason,
+                )
+
                 event.event_type = nio.RedactedEvent
-                gather_list.append(
+
+                tasks.append(
                     self.room_redact(room_id, event.event_id, reason),
                 )
 
-        return await asyncio.gather(*gather_list)
+        return await asyncio.gather(*tasks)
 
 
     async def generate_thumbnail(

src/backend/nio_callbacks.py

@@ -192,23 +192,16 @@ class NioCallbacks:
 
 
     async def onRedactedEvent(self, room, ev, event_id: str = "") -> None:
-        kind = ev.source["type"].split(".")[-1].replace("_", " ")
-
-        if kind != "message":
-            kind = f"{kind} event"
-
-        co = f"%1 removed this {kind}" if ev.redacter == ev.sender else \
-             f"%1's {kind} was removed by %2"
-
-        if ev.reason:
-            co = f"{co}, reason: {ev.reason}"
-
         await self.client.register_nio_event(
             room,
             ev,
             event_id = event_id,
             reason   = ev.reason or "",
-            content       = co,
+
+            content = await self.client.get_redacted_event_content(
+                ev.source["type"], ev.redacter, ev.sender, ev.reason,
+            ),
+
             redacter_id   = ev.redacter or "",
             redacter_name =
                 (await self.client.get_member_name_avatar(