Reference splitcheckout as a checkout redirect

This stored in session value is used to redirect after login

Update tests as well, thanks @filipefurtad0 ! 🙏

app/controllers/application_controller.rb

@@ -62,7 +62,9 @@ class ApplicationController < ActionController::Base
   end
 
   def set_checkout_redirect
-    return unless URI(request.referer.to_s).path == main_app.checkout_path
+    referer_path = URI(request.referer.to_s).path
+    return unless referer_path == main_app.checkout_path ||
+                  referer_path == main_app.checkout_step_path(:details)
 
     session["spree_user_return_to"] = main_app.checkout_path
   end

app/controllers/split_checkout_controller.rb

@@ -16,6 +16,8 @@ class SplitCheckoutController < ::BaseController
   helper 'spree/orders'
   helper OrderHelper
 
+  before_action :set_checkout_redirect
+
   def edit
     redirect_to_step unless params[:step]
   end

spec/system/consumer/shopping/checkout_auth_spec.rb

@@ -66,12 +66,8 @@ describe "As a consumer I want to check out my cart", js: true do
           end
 
           context "and populating user details on (#{checkout_type})", if: checkout_type.eql?("split_checkout") do
-            it "currently redirects to the homepage" do
-              # currently redirects to the homepage due to bug #8894
-              expect(page).to have_content("Logged in successfully")
-            end
             it "should allow proceeding to the next step" do
-              pending("bug fix for #8894")
+              expect(page).to have_content("Logged in successfully")
               click_button "Next - Payment method"
               expect(page).to have_button("Next - Order summary")
             end