2be1eb480f
If you tap outside the drop down menu while its animating in, we should animate it away smoothly. Previously, we jumped to the reverseCurve, which made the menu disappear immediately. Now we hold the animations as state, which means we keep their _curveDirection property and don't switch curves unless the animation actually finishes. Also, fix a subtle bug in CurvedAnimation whereby we'd never set the _curveDirection if we didn't see a status change in the parent animation. Now we initialize _curveDirection based on the current value of the parent's status. Fixes #4379
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