Move tooltips for new diff expansion buttons to the side
Problem
With the new design for the diff expansion buttons, we have put the information of "Next/Previous 20 lines" into a tooltip. That's a great change, but the tooltip of the lower button hides the upper button, so that if you notice that you rather want to choose the other button, you are forced to first move out of the button and wait.
Solution
Let's move the tooltip to the right or left side (I don't mind too much, if somebody has a reason why one of these would be preferred I would love to hear). That way, they don't overlap interactive content that the user might want to navigate to next.