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Added Hero zero-frame animation documentation (#30048)

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Shi-Hao Hong 2019-03-27 18:17:12 -07:00 committed by GitHub
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packages/flutter/lib/src/widgets/heroes.dart
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@ -77,11 +77,13 @@ Rect _globalBoundingBoxFor(BuildContext context) {
/// same tag, a hero animation is triggered.
///
/// If a [Hero] is already in flight when navigation occurs, its
/// flight animation will be redirected to its new destination.
/// The widget shown in-flight during the transition is, by default, the
/// flight animation will be redirected to its new destination. The
/// widget shown in-flight during the transition is, by default, the
/// destination route's [Hero]'s child.
///
/// For a Hero animation to trigger, the Hero has to exist on the very first
/// frame of the new page's animation.
///
/// Routes must not contain more than one [Hero] for each [tag].
///
/// ## Discussion