重要改动 (Breaking changes)

As described in the breaking change policy, on occasion we publish guides for migrating code across a breaking change. The following guides (in alphabetical order) are available:

• Annotations return local position relative to object
• Generic type of ParentDataWidget changed to ParentData
• ImageCache large images
• ImageCache large images
• MouseTracker no longer attaches annotations
• Nullable CupertinoTheme.brightness
• Rebuild optimization for OverlayEntries and Routes
• Scrollable AlertDialog
• TestTextInput state reset
• TextInputClient currentTextEditingValue
• The Route and Navigator Refactoring
• The forgetChild method must call super
• ThemeData’s accent properties