Test using inportal with advanced theme
# Create new link in Directory section
# In `themes/advanced/in-link/elements/links.elm.tpl` add `<inp2:AdminEditButton test="testvalue"/>` just after `<inp2:AdminEditButton/>`
# Goto {nav Website & Content > Browse Website}, navigate to `Directory` section and switch to `Content Mode`
# Open `Network` tab in browser developer tools
# Click on first `Edit Item` button near created link and check url with OnEdit event doesn't contains test=testvalue
# Click on second `Edit Item` button near created link and check url with OnEdit event contains test=testvalue