Add code-lens to show references and impls

Cargo.toml

@@ -800,13 +800,15 @@ calloop = { git = "https://github.com/zed-industries/calloop" }
 
 [profile.dev]
 split-debuginfo = "unpacked"
+debug = 1
 incremental = true
-codegen-units = 16
+codegen-units = 256
 
 # mirror configuration for crates compiled for the build platform
 # (without this cargo will compile ~400 crates twice)
 [profile.dev.build-override]
-codegen-units = 16
+debug = 1
+codegen-units = 256
 
 [profile.dev.package]
 # proc-macros start

assets/settings/default.json

@@ -310,6 +310,13 @@
     // The delay in milliseconds that must elapse before drag and drop is allowed. Otherwise, a new text selection is created.
     "delay": 300,
   },
+  // Code lens settings for showing reference counts and other metadata above code elements.
+  "code_lens": {
+    // Whether code lens is enabled.
+    "enabled": true,
+    // The debounce delay in milliseconds before querying code lens from the language server.
+    "debounce": 300
+  },
   // What to do when go to definition yields no results.
   //
   // 1. Do nothing: `none`

crates/editor/src/actions.rs

@@ -825,6 +825,8 @@ actions!(
         ToggleIndentGuides,
         /// Toggles inlay hints display.
         ToggleInlayHints,
+        /// Toggles code lens display.
+        ToggleCodeLens,
         /// Toggles inline values display.
         ToggleInlineValues,
         /// Toggles inline diagnostics display.