Fix transient error clicking dropdown items in compare_spec.rb

spec/features/projects/compare_spec.rb

@@ -52,8 +52,10 @@ describe "Compare", js: true do
   def select_using_dropdown(dropdown_type, selection)
     dropdown = find(".js-compare-#{dropdown_type}-dropdown")
     dropdown.find(".compare-dropdown-toggle").click
+    dropdown.find('.dropdown-menu')
     dropdown.fill_in("Filter by Git revision", with: selection)
     wait_for_requests
-    dropdown.find_all("a[data-ref=\"#{selection}\"]", visible: true).last.click
+    dropdown.find("a[data-ref=\"#{selection}\"]", match: :first)
+    dropdown.all("a[data-ref=\"#{selection}\"]").last.click
   end
 end