Synchronize buffers when either the host or a guest reconnects

crates/rpc/src/proto.rs

@@ -207,6 +207,8 @@ messages!(
     (ShareProjectResponse, Foreground),
     (ShowContacts, Foreground),
     (StartLanguageServer, Foreground),
+    (SynchronizeBuffers, Foreground),
+    (SynchronizeBuffersResponse, Foreground),
     (Test, Foreground),
     (Unfollow, Foreground),
     (UnshareProject, Foreground),
@@ -274,6 +276,7 @@ request_messages!(
     (SearchProject, SearchProjectResponse),
     (SendChannelMessage, SendChannelMessageResponse),
     (ShareProject, ShareProjectResponse),
+    (SynchronizeBuffers, SynchronizeBuffersResponse),
     (Test, Test),
     (UpdateBuffer, Ack),
     (UpdateParticipantLocation, Ack),
@@ -315,6 +318,7 @@ entity_messages!(
     SaveBuffer,
     SearchProject,
     StartLanguageServer,
+    SynchronizeBuffers,
     Unfollow,
     UnshareProject,
     UpdateBuffer,