Synchronize buffers when either the host or a guest reconnects

crates/rpc/proto/zed.proto

@@ -79,6 +79,8 @@ message Envelope {
         BufferReloaded buffer_reloaded = 61;
         ReloadBuffers reload_buffers = 62;
         ReloadBuffersResponse reload_buffers_response = 63;
+        SynchronizeBuffers synchronize_buffers = 200;
+        SynchronizeBuffersResponse synchronize_buffers_response = 201;
         FormatBuffers format_buffers = 64;
         FormatBuffersResponse format_buffers_response = 65;
         GetCompletions get_completions = 66;
@@ -538,6 +540,20 @@ message ReloadBuffersResponse {
     ProjectTransaction transaction = 1;
 }
 
+message SynchronizeBuffers {
+    uint64 project_id = 1;
+    repeated BufferVersion buffers = 2;
+}
+
+message SynchronizeBuffersResponse {
+    repeated BufferVersion buffers = 1;
+}
+
+message BufferVersion {
+    uint64 id = 1;
+    repeated VectorClockEntry version = 2;
+}
+
 enum FormatTrigger {
     Save = 0;
     Manual = 1;

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,