### Preflight Checklist

- [X] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
- [X] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
- [X] I have searched the [issue tracker](https://www.github.com/electron/electron/issues) for a feature request that matches the one I want to file, without success.

### Electron Version

12.0.5

### What operating system are you using?

macOS

### Operating System Version

11.2.3

### What arch are you using?

arm64 (including Apple Silicon)

### Last Known Working Electron version

_No response_

### Expected Behavior

`document.hasFocus()` is only `true` for the window that has focus.

### Actual Behavior

Ever window reports `document.hasFocus()` to be `true` right after opening.

### Testcase Gist URL

https://gist.github.com/16e6fc829febd0cab115dfd0850a31be

### Additional Information

_No response_
shell/browser/api/electron_api_web_contents.cc
const std::string& file_system_path) {
  devtools_indexing_jobs_.erase(request_id);
  base::Value request_id_value(request_id);
  base::Value file_system_path_value(file_system_path);
  inspectable_ontents_->CallClientFunction(
      "DevToolsAPI.indexingDone", &request_id_value, &file_system_path_value,
      nullptr);
}
void WebContents::OnDevToolsSearchCompleted(
    int request_id,
    const std::string& file_system_path,
    const std::vector<std::string>& file_paths) {
  base::ListValue file_paths_value;
  for (const auto& file_path : file_paths) {
    file_paths_value.AppendString(file_path);
  }
  base::Value request_id_value(request_id);
  base::Value file_system_path_value(file_system_path);
  inspectable_ontents_->CallClientFunction(
      "DevToolsAPI.searchCompleted", &request_id_value, &file_system_path_value,
      &file_paths_value);
}
void WebContents::SetHtmlApiFullscreen(bool enter_fullscreen) {