Hero animation is a bit weird

[urmilshroff]

Ever since I added the SQLite database, Hero animation of the dartIcon between the GoalsPage and EditGoal pages has become a little weird. It looks normal for goals at the top of the screen in the ListView, but very elastic and exaggerated for goals at the bottom of the screen.

It isn't goal-specific, it is position specific: if you scroll, different goals will show strange animation behaviour.