Allow Fields from Current User

Just add a patch generated from the merge request after the 5th commit:

https://git.drupalcode.org/project/views_arg_entity_field/-/merge_reques...

Note: it might also be useful to use the Drupal 9 patch here: 🐛 Fix label token replacement for views entity reference arguments RTBC so that entity ids are shown using their labels.

    "patches": {
        "drupal/views_arg_entity_field": {
            "#3364511: Support Current User field": "https://www.drupal.org/files/issues/2023-06-02/3364511-support-current-user-fields-3.patch"
        },
        "drupal/core": {
            "#2640994: Show entity labels instead of ids (for Announcements)" : "https://www.drupal.org/files/issues/2022-09-24/2640994-137.patch"
        }
    },

Addresses: 🐛 NULL value should be empty string Postponed: needs info

Sounds like a great improvement.

I checked MR, and changes is not so big.
But there are a lot places with code duplication, so I will set status to NW.

I have several ideas how to refactor the code:
1) Add "Current user" for $form['entity_type_id'].
2) Extends CurrentUserFieldValue from CurrentEntityFieldValue.
3) Create common abstract class for CurrentEntityFieldValue, CurrentUserFieldValue.

Only thing I am not sure is views caching.

Added branch 3364511-refactor just as prototype. Not finished.

I was searching how to improve solution and I found that there is a module with just exact functionality:
Views user field value contextual filter [user_field_value] →

And there are more modules that also introduce some nice features, like token support for views default value:

• https://www.drupal.org/project/user_field_value →
• https://www.drupal.org/project/views_argument_token →
• https://www.drupal.org/project/views_extras →
• https://www.drupal.org/project/views_arg_entity_field →

Maybe we can combine these modules?
Let's have discussion before we continue to work on this feature request.