Avoid reading from deleted file

lib/ruby_lsp/server.rb

@@ -1051,14 +1051,14 @@ def handle_ruby_file_change(index, file_path, change_type)
       load_path_entry = $LOAD_PATH.find { |load_path| file_path.start_with?(load_path) }
       uri = URI::Generic.from_path(load_path_entry: load_path_entry, path: file_path)
 
-      content = File.read(file_path)
-
       case change_type
       when Constant::FileChangeType::CREATED
+        content = File.read(file_path)
         # If we receive a late created notification for a file that has already been claimed by the client, we want to
         # handle change for that URI so that the require path tree is updated
         @store.key?(uri) ? index.handle_change(uri, content) : index.index_single(uri, content)
       when Constant::FileChangeType::CHANGED
+        content = File.read(file_path)
         # We only handle changes on file watched notifications if the client is not the one managing this URI.
         # Otherwise, these changes are handled when running the combined requests
         index.handle_change(uri, content) unless @store.key?(uri)

test/server_test.rb

@@ -521,6 +521,28 @@ def test_did_change_watched_files_does_not_fail_for_non_existing_files
     end
   end
 
+  def test_did_change_watched_files_handles_deletions
+    path = File.join(Dir.pwd, "lib", "foo.rb")
+
+    @server.global_state.index.expects(:delete).once.with do |uri|
+      uri.full_path == path
+    end
+
+    uri = URI::Generic.from_path(path: path)
+
+    @server.process_message({
+      method: "workspace/didChangeWatchedFiles",
+      params: {
+        changes: [
+          {
+            uri: uri,
+            type: RubyLsp::Constant::FileChangeType::DELETED,
+          },
+        ],
+      },
+    })
+  end
+
   def test_did_change_watched_files_reports_addon_errors
     Class.new(RubyLsp::Addon) do
       def activate(global_state, outgoing_queue); end