markConversationMessagesAsRead abstract method
Marks sent/delivered messages in a conversation as read.
Called when a conversation-level read receipt arrives (the other user opened the chat), indicating they have seen the messages you sent.
senderIdFilter — when provided, only messages with that sender_id are
updated. Pass the current user's ID so that only your own sent messages
are promoted to 'read'; received messages are left unchanged.
Implementation
Future<void> markConversationMessagesAsRead(String conversationId, {String? senderIdFilter});