message: Fixed issue with arrow between start and stop fields getting focus when tabbing (mac),
diff: <constraints>
  <constraint firstAttribute="width" constant="12" id="kq9-bs-ARZ"/>
  </constraints>
  - <buttonCell key="cell" type="square" bezelStyle="shadowlessSquare" image="duration-arrow" imagePosition="only" alignment="center" focusRingType="none" imageScaling="proportionallyUpOrDown" inset="2" id="STZ-g4-LxO">
  + <buttonCell key="cell" type="square" bezelStyle="shadowlessSquare" image="duration-arrow" imagePosition="only" alignment="center" refusesFirstResponder="YES" focusRingType="none" imageScaling="proportionallyUpOrDown" inset="2" id="STZ-g4-LxO">
  <behavior key="behavior" pushIn="YES" lightByBackground="YES" lightByGray="YES"/>
  <font key="font" metaFont="system"/>
  </buttonCell>
  