Dragging a pin before the start

Ah, makes sense. i was distracted by the dotted line that appeared to be leading to the staff name, and thought "pin" might have been a strange typo for "Piano", but couldn't see anything wrong with the staff name. Now I see what is meant - if you drag the right hand edge of the hairpin to the left, all the way past the left hand edge and beyond, it appears to "reverse" the hairpin whle dragging (the dotted lone is actually showing the hairpin drag in action) but the hairpin itself doesn't actually reverse - it stops at some minimum size.

I'd say the expected behavior would be that if you tried dragging too far left, the mouse might go there, but the handle you are dragging would stop moving. Either that or the hairpin should actually reverse, truly reflecting the drag.