Pressing <return> in any of the campaign edit fields will default to the "filter banners" submit, rather than the edit form submit.
Banner filtering should be done using ajax, without a page refresh, or the "add banner" action should open a modal dialog. Or, if we want to do it without javascript, there should be a second form and the main form's submit buttons moved closer to that section of the form.
This issue might be deprecated by work in https://gerrit.wikimedia.org/r/57090
Version: master
Severity: minor