Support only UTF-8 for now when communicating with language server

crates/lsp/Cargo.toml

@@ -13,7 +13,7 @@ anyhow = "1.0"
 async-pipe = { git = "https://github.com/routerify/async-pipe-rs", rev = "feeb77e83142a9ff837d0767652ae41bfc5d8e47", optional = true }
 futures = "0.3"
 log = "0.4"
-lsp-types = "0.91"
+lsp-types = { version = "0.91", features = ["proposed"] }
 parking_lot = "0.11"
 postage = { version = "0.4.1", features = ["futures-traits"] }
 serde = { version = "1.0", features = ["derive"] }

crates/lsp/src/lib.rs

@@ -226,6 +226,7 @@ impl LanguageServer {
                 experimental: Some(json!({
                     "serverStatusNotification": true,
                 })),
+                offset_encoding: Some(vec!["utf-8".to_string()]),
                 ..Default::default()
             },
             trace: Default::default(),