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Update assert message for AnimatedContainer (#48962)

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The error message was misleading because BoxDecoration does not have a `backgroundColor` parameter. Instead it has a `color` parameter, which sets the background color. I also removed the optional `new` keyword.
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suragch 2020-01-17 02:03:43 +08:00 committed by Michael Goderbauer
parent ee1fa94b4d
commit 4c1d79f42f
1 changed files with 1 additions and 1 deletions
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packages/flutter/lib/src/widgets/implicit_animations.dart
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@ -649,7 +649,7 @@ class AnimatedContainer extends ImplicitlyAnimatedWidget {
assert(constraints == null || constraints.debugAssertIsValid()), assert(constraints == null || constraints.debugAssertIsValid()),
assert(color == null || decoration == null, assert(color == null || decoration == null,
'Cannot provide both a color and a decoration\n' 'Cannot provide both a color and a decoration\n'
'The color argument is just a shorthand for "decoration: new BoxDecoration(backgroundColor: color)".' 'The color argument is just a shorthand for "decoration: BoxDecoration(color: color)".'
), ),
decoration = decoration ?? (color != null ? BoxDecoration(color: color) : null), decoration = decoration ?? (color != null ? BoxDecoration(color: color) : null),
constraints = constraints =