Line check to avoid traversing all method.

Source/DafnyLanguageServer/Plugins/DafnyCodeActionHelpers.cs

@@ -132,14 +132,16 @@ private static (Range? beforeEndBrace, string indentationExtra, string indentati
  // Return the EndTok of them.
  foreach (var module in program.Modules()) {
  foreach (var topLevelDecl in module.TopLevelDecls) {
- if (topLevelDecl is ClassDecl classDecl) {
+ if (topLevelDecl is ClassDecl classDecl && (classDecl.StartToken.line == 0 || classDecl.StartToken.Filename == documentUri && classDecl.StartToken.line <= line && line <= classDecl.EndToken.line)) {
  foreach (var member in classDecl.Members) {
  if (member is Method method && method.tok.filename == documentUri && method.Body != null &&
+ method.StartToken.line <= line && line <= method.EndToken.line &&
  GetMatchingEndToken(line, col, method.Body) is { } token) {
  return token;
  }
 
  if (member is Function { ByMethodBody: { } } function &&
+ function.StartToken.line <= line && line <= function.EndToken.line &&
  GetMatchingEndToken(line, col, function.ByMethodBody) is { } token2) {
  return token2;
  }