Fix race condition when opening a buffer and getting a definition to it

crates/language/src/buffer.rs

@@ -305,7 +305,7 @@ impl Buffer {
 
     pub fn from_proto(
         replica_id: ReplicaId,
-        message: proto::Buffer,
+        message: proto::BufferState,
         file: Option<Box<dyn File>>,
         cx: &mut ModelContext<Self>,
     ) -> Result<Self> {
@@ -359,8 +359,8 @@ impl Buffer {
         Ok(this)
     }
 
-    pub fn to_proto(&self) -> proto::Buffer {
-        proto::Buffer {
+    pub fn to_proto(&self) -> proto::BufferState {
+        proto::BufferState {
             id: self.remote_id(),
             file: self.file.as_ref().map(|f| f.to_proto()),
             visible_text: self.text.text(),

crates/language/src/proto.rs

@@ -7,7 +7,7 @@ use rpc::proto;
 use std::sync::Arc;
 use text::*;
 
-pub use proto::{Buffer, SelectionSet};
+pub use proto::{Buffer, BufferState, SelectionSet};
 
 pub fn serialize_operation(operation: &Operation) -> proto::Operation {
     proto::Operation {