new_contents: import vanilla
  
  class EqualizeSidebearingsPreferences(object):
  
      def __init__(self):
          self.w = vanilla.Window((200, 70), 'Equalize Sidebearings')
          self.w.activation_key = vanilla.EditText((0, 0, 0, 0), 'e')
          self.w.open()
  
  EqualizeSidebearingsPreferences()
  
subject: Add preferences.py