Add option to disable backfilling normal groups

mautrix_telegram/commands/telegram/misc.py

@@ -346,6 +346,9 @@ async def backfill(evt: CommandEvent) -> None:
     except (ValueError, IndexError):
         limit = -1
     portal = po.Portal.get_by_mxid(evt.room_id)
+    if not evt.config["bridge.backfill.normal_groups"] and portal.peer_type == "chat":
+        await evt.reply("Backfilling normal groups is disabled in the bridge config")
+        return
     try:
         await portal.backfill(evt.sender, limit=limit)
     except TakeoutInitDelayError:

mautrix_telegram/config.py

@@ -123,6 +123,7 @@ class Config(BaseBridgeConfig):
         copy("bridge.backfill.initial_limit")
         copy("bridge.backfill.missed_limit")
         copy("bridge.backfill.disable_notifications")
+        copy("bridge.backfill.normal_groups")
 
         copy("bridge.initial_power_level_overrides.group")
         copy("bridge.initial_power_level_overrides.user")

mautrix_telegram/example-config.yaml

@@ -260,6 +260,10 @@ bridge:
         # If using double puppeting, should notifications be disabled
         # while the initial backfill is in progress?
         disable_notifications: false
+        # Whether or not to enable backfilling in normal groups.
+        # Normal groups have numerous technical problems in Telegram, and backfilling normal groups
+        # will likely cause problems if there are multiple Matrix users in the group.
+        normal_groups: false
 
     # Overrides for base power levels.
     initial_power_level_overrides:

mautrix_telegram/portal/telegram.py

@@ -427,6 +427,8 @@ class PortalTelegram(BasePortal, ABC):
                           else config["bridge.backfill.missed_limit"])
         if limit == 0:
             return
+        if not config["bridge.backfill.normal_groups"] and self.peer_type == "chat":
+            return
         last = DBMessage.find_last(self.mxid, (source.tgid if self.peer_type != "channel"
                                                else self.tgid))
         min_id = last.tgid if last else 0