Use Capybara find methods and remove sleeps in feature specs in "All Issues" filter

app/views/shared/issuable/_filter.html.haml

@@ -15,7 +15,7 @@
         .filter-item.inline
           - if params[:assignee_id]
             = hidden_field_tag(:assignee_id, params[:assignee_id])
-          = dropdown_tag("Assignee", options: { toggle_class: "js-user-search js-filter-submit", title: "Filter by assignee", filter: true, dropdown_class: "dropdown-menu-user dropdown-menu-selectable",
+          = dropdown_tag("Assignee", options: { toggle_class: "js-user-search js-filter-submit js-assignee-search", title: "Filter by assignee", filter: true, dropdown_class: "dropdown-menu-user dropdown-menu-selectable",
             placeholder: "Search assignee", data: { any_user: "Any Author", first_user: (current_user.username if current_user), null_user: true, current_user: true, project_id: (@project.id if @project), selected: params[:assignee_id], field_name: "assignee_id" } })
 
         .filter-item.inline.milestone-filter

features/steps/dashboard/issues.rb

@@ -44,14 +44,11 @@ class Spinach::Features::DashboardIssues < Spinach::FeatureSteps
   end
 
   step 'I click "All" link' do
-    execute_script('$(".js-user-search").first().click()')
-    sleep 1
-    execute_script('$(".js-user-search").first().parent().find("li a").first().click()')
-    sleep 1
-    execute_script('$(".js-user-search").eq(1).click()')
-    sleep 1
-    execute_script('$(".js-user-search").eq(1).parent().find("li a").first().click()')
-    sleep 1
+    find('.js-author-search').click
+    find('.dropdown-menu-user-full-name', match: :first).click
+
+    find('.js-assignee-search').click
+    find('.dropdown-menu-user-full-name', match: :first).click
   end
 
   def should_see(issue)