Add config option to mark joined Telegram notices as read automatically

mautrix_telegram/config.py

@@ -159,6 +159,7 @@ class Config(BaseBridgeConfig):
         copy("bridge.tag_only_on_create")
         copy("bridge.bridge_matrix_leave")
         copy("bridge.kick_on_logout")
+        copy("bridge.always_read_joined_telegram_notice")
         copy("bridge.backfill.invite_own_puppet")
         copy("bridge.backfill.takeout_limit")
         copy("bridge.backfill.initial_limit")

mautrix_telegram/example-config.yaml

@@ -282,6 +282,8 @@ bridge:
     bridge_matrix_leave: true
     # Should the user be kicked out of all portals when logging out of the bridge?
     kick_on_logout: true
+    # Should the "* user joined Telegram" notice always be marked as read automatically?
+    always_read_joined_telegram_notice: true
     # Settings for backfilling messages from Telegram.
     backfill:
         # Whether or not the Telegram ghosts of logged in Matrix users should be

mautrix_telegram/portal.py

@@ -3339,10 +3339,7 @@ class Portal(DBPortal, BasePortal):
             tg_space=source.tgid,
             edit_index=0,
         ).insert()
-        # Automatically mark the notice as read if we're backfilling messages, mostly so that
-        # empty rooms created before the notice was added wouldn't become unread when the notice
-        # is backfilled in.
-        if backfill:
+        if self.config["bridge.always_read_joined_telegram_notice"]:
             double_puppet = await p.Puppet.get_by_tgid(source.tgid)
             if double_puppet and double_puppet.is_real_user:
                 await double_puppet.intent.mark_read(self.mxid, event_id)