Index page filtering ignores the current scope

[mattruzicka]

In rails_admin version 3.1.2, when a model is configured to have tabbed scopes on the index page and you do a filter search, the results are always scoped to the first tab and not the current scope/tab as expected.

Reproduction steps

I updated the active_record dummy app Ball model to have scopes like this:

# frozen_string_literal: true

class Ball < ActiveRecord::Base
  has_one :comment, as: :commentable

  validates_presence_of :color, on: :create

  scope :red, -> { where(color: 'red') }
  scope :green, -> { where(color: 'green') }
  scope :blue, -> { where(color: 'blue') }

  def to_param
    color.present? ? color.downcase.tr(' ', '-') : id
  end

  rails_admin do
    list do
      scopes [:red, :green, :blue]
    end
  end
end

Here you can see that I'm on the "Blue" scope tab and added a filter to only show balls of type "Basketball".

After clicking refresh, I expect the page to stay on the "Blue" tab and show only basketballs, but instead, it updates to only show basketballs for the default scope which is "Red".

If I then click on the blue tab, I see the results that I expected, but having to do that is an extra step and breaks the expectations set by previous versions.

Additional context

• rails version: 6.1.7.6
• rails_admin version: 3.1.2

I'm updating from rails_admin version 2.2.1, so I know that scopes and filters behaved as expected in at least that version.