Assert successful sign in after registration

`.has_personal_area?` waits for sign in but does not ensure that it's
successful. Raise an exception if not successful so we can capture
a screenshot at the point of failure

Adds a workaround and code to help troubleshoot why a new user doesn't
stay signed in after loading a project page.

qa/qa/factory/resource/fork.rb

@@ -13,8 +13,43 @@ module QA
 
         product(:user) { |factory| factory.user }
 
+        def visit_project_with_retry
+          # The user intermittently fails to stay signed in after visiting the
+          # project page. The new user is registered and then signs in and a
+          # screenshot shows that signing in was successful. Then the project
+          # page is visited but a screenshot shows the user is no longer signed
+          # in. It's difficult to reproduce locally but GDK logs don't seem to
+          # show anything unexpected. This method attempts to work around the
+          # problem and capture data to help troubleshoot.
+
+          Capybara::Screenshot.screenshot_and_save_page
+
+          start = Time.now
+
+          while Time.now - start < 20
+            push.project.visit!
+
+            puts "Visited project page"
+            Capybara::Screenshot.screenshot_and_save_page
+
+            return if Page::Menu::Main.act { has_personal_area?(wait: 0) }
+
+            puts "Not signed in. Attempting to sign in again."
+            Capybara::Screenshot.screenshot_and_save_page
+
+            Page::Menu::Main.act { sign_out }
+
+            Page::Main::Login.perform do |login|
+              login.sign_in_using_credentials(user)
+            end
+          end
+
+          raise "Failed to load project page and stay logged in"
+        end
+
         def fabricate!
-          push.project.visit!
+          visit_project_with_retry
+
           Page::Project::Show.act { fork_project }
 
           Page::Project::Fork::New.perform do |fork_new|

qa/qa/page/main/sign_up.rb

@@ -19,7 +19,7 @@ module QA
           fill_in :new_user_password, with: user.password
           click_button 'Register'
 
-          Page::Menu::Main.act { has_personal_area? }
+          Page::Menu::Main.act { assert_has_personal_area }
         end
       end
     end

qa/qa/page/menu/main.rb

@@ -61,8 +61,13 @@ module QA
         end
 
         def has_personal_area?(wait: Capybara.default_max_wait_time)
-          # No need to wait, either we're logged-in, or not.
-          using_wait_time(wait) { page.has_selector?('.qa-user-avatar') }
+          using_wait_time(wait) do
+            page.has_selector?(element_selector_css(:user_avatar))
+          end
+        end
+
+        def assert_has_personal_area
+          raise "Failed to sign in" unless has_personal_area?
         end
 
         private