Long strings in ComboBoxes or Dropdown lists will be cut off if the width isn't enough to display the string in one line.
This could be very frustrating when trying to select the right item but the ComboBox/ Dropdown isn't wide enough.
So as a user I must be able to see the whole string in the list for example with a 'word-wrap'-feature or as a 'tooltip' while hovering over the items in the list.