Make number of chats to sync configurable

example-config.yaml

@@ -50,6 +50,9 @@ bridge:
     # The prefix for commands. Only required in non-management rooms.
     command_prefix: "!fb"
 
+    # Number of chats to sync (and create portals for) on startup/login.
+    # Maximum 20, set 0 to disable automatic syncing.
+    initial_chat_sync: 10
     # Whether or not the Facebook users of logged in Matrix users should be
     # invited to private chats when the user sends a message from another client.
     invite_own_puppet_to_pm: false

mautrix_facebook/config.py

@@ -66,6 +66,7 @@ class Config(BaseFileConfig):
 
         copy("bridge.command_prefix")
 
+        copy("bridge.initial_chat_sync")
         copy("bridge.invite_own_puppet_to_pm")
         copy("bridge.sync_with_custom_puppets")
         copy("bridge.presence")

mautrix_facebook/user.py

@@ -143,8 +143,11 @@ class User(Client):
 
     async def sync_threads(self) -> None:
         try:
+            sync_count = min(20, config["bridge.initial_chat_sync"])
+            if sync_count <= 0:
+                return
             self.log.debug("Fetching threads...")
-            threads = await self.fetchThreadList(limit=10)
+            threads = await self.fetchThreadList(limit=sync_count)
             for thread in threads:
                 self.log.debug(f"Syncing thread {thread.uid} {thread.name}")
                 fb_receiver = self.uid if thread.type == ThreadType.USER else None