Add option to disable reply fallbacks

mautrix_telegram/config.py

@@ -156,6 +156,7 @@ class Config(BaseBridgeConfig):
             copy("bridge.private_chat_portal_meta")
             if base["bridge.private_chat_portal_meta"] not in ("default", "always", "never"):
                 base["bridge.private_chat_portal_meta"] = "default"
+        copy("bridge.disable_reply_fallbacks")
         copy("bridge.delivery_receipts")
         copy("bridge.delivery_error_reports")
         copy("bridge.incoming_bridge_error_reports")

mautrix_telegram/example-config.yaml

@@ -331,6 +331,9 @@ bridge:
     # If set to `always`, all DM rooms will have explicit names and avatars set.
     # If set to `never`, DM rooms will never have names and avatars set.
     private_chat_portal_meta: default
+    # Disable generating reply fallbacks? Some extremely bad clients still rely on them,
+    # but they're being phased out and will be completely removed in the future.
+    disable_reply_fallbacks: false
     # Whether or not the bridge should send a read receipt from the bridge bot when a message has
     # been sent to Telegram.
     delivery_receipts: false

mautrix_telegram/portal_util/message_convert.py

@@ -259,6 +259,7 @@ class TelegramMessageConverter:
         )
         reply_to_id = TelegramID(evt.reply_to.reply_to_msg_id)
         msg = await DBMessage.get_one_by_tgid(reply_to_id, space)
+        no_fallback = no_fallback or self.config["bridge.disable_reply_fallbacks"]
         if not msg or msg.mx_room != self.portal.mxid:
             if deterministic_id:
                 content.set_reply(self.deterministic_event_id(space, reply_to_id))