message: Make DocumentLink::range narrower
  Thanks to Riatre
diff: @@ -78,13 +78,22 @@ MAKE_REFLECT_STRUCT(DocumentLink, range, target);
  void MessageHandler::textDocument_documentLink(TextDocumentParam &param,
  ReplyOnce &reply) {
  QueryFile *file = FindFile(reply, param.textDocument.uri.GetPath());
  - if (!file)
  + WorkingFile *wf = file ? wfiles->GetFileByFilename(file->def->path) : nullptr;
  + if (!wf) {
  + reply.Error(ErrorCode::InternalError, "not opened");
  return;
  + }
  std::vector<DocumentLink> result;
  for (const IndexInclude &include : file->def->includes)
  - result.push_back({lsRange{{include.line, 0}, {include.line + 1, 0}},
  + if (std::optional<int> bline =
  + wf->GetBufferPosFromIndexPos(include.line, nullptr, false)) {
  + const std::string &line = wf->buffer_lines[*bline];
  + auto start = line.find_first_of("\"<"), end = line.find_last_of("\">");
  + if (start < end)
  + result.push_back({lsRange{{*bline, (int)start + 1}, {*bline, (int)end}},
  DocumentUri::FromPath(include.resolved_path)});
  + }
  reply(result);
  } // namespace ccls
  