relay/api: close obsolete buffers when reconnecting to the remote

This closes all buffers that exist locally but not on the remote any more,
after reconnecting to the remote.

CHANGELOG.md

@@ -62,7 +62,8 @@
 - relay/api: fix timezone of dates sent to clients ([#2151](https://github.com/weechat/weechat/issues/2151))
 - relay/api: clear lines and nicklist on all remote buffers upon successful connection to the remote ([#2161](https://github.com/weechat/weechat/issues/2161))
 - relay/api: fix buffers synchronization with existing buffers that have been renamed on remote in the meanwhile ([#2169](https://github.com/weechat/weechat/issues/2169))
-- relay/api: do not reset input text on existing buffers when reconnecting to remote
+- relay/api: do not reset input text on existing buffers when reconnecting to the remote
+- relay/api: close obsolete buffers when reconnecting to the remote
 - relay/api: fix "body_type" returned when lines or nicks of a buffer are requested
 - relay/api: fix read of one buffer line
 - relay: fix websocket permessage-deflate extension when the client doesn't send the max window bits parameters ([#1549](https://github.com/weechat/weechat/issues/1549))

src/plugins/relay/api/remote/relay-remote-event.h

@@ -20,6 +20,8 @@
 #ifndef WEECHAT_PLUGIN_RELAY_REMOTE_EVENT_H
 #define WEECHAT_PLUGIN_RELAY_REMOTE_EVENT_H
 
+#define RELAY_REMOTE_EVENT_ID_INITIAL_SYNC "initial_sync"
+
 #define RELAY_REMOTE_EVENT_CALLBACK(__body_type)                        \
     int                                                                 \
     relay_remote_event_cb_##__body_type (                               \

tests/unit/plugins/relay/api/remote/test-relay-remote-event.cpp

@@ -185,6 +185,16 @@ TEST(RelayRemoteEvent, RemoveLocalVarCb)
     /* TODO: write tests */
 }
 
+/*
+ * Tests functions:
+ *   relay_remote_event_initial_sync_buffers
+ */
+
+TEST(RelayRemoteEvent, InitialSyncBuffers)
+{
+    /* TODO: write tests */
+}
+
 /*
  * Tests functions:
  *   relay_remote_event_cb_buffer