td_api::searchChatMessages returns incomplete vector of messages.

[Firemoon777]

I tried to retrieve all messages with documents by using filter searchMessagesFilterDocument.

std::int32_t offset = 0, limit = 50;
td_api::make_object<td_api::searchChatMessages>(id_, "", 0, 0, offset, limit, std::move(filter))

I have response of type object_ptr< messages > in callback
response->total_count_ equals to 5 (it's correct, I checked with Telegram Desktop), but response->messages.size() equals to 1 and contains only newest message with document from chat.
I tried to change limit/offset, but no luck.
How can I retrieve all messages with documents?

[levlam]

It is desired (and documented) behavior. From the parameter limit description: "Fewer messages may be returned than specified by the limit, even if the end of the message history has not been reached".
In order to get more messages, you should call again searchChatMessages with from_message_id equal to message identifier of the last received message.
Offset should be always 0, if you retrieving messages from oldest to newest.

[Firemoon777]

It was a bit confusing. I figured it out, thanks!