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It seems that setTraversalBefore doesn't work as well as setTraversalAfter for some reason, although I'm using them the same way. Some apps would lock up TalkBack when traversing if setTraversalBefore was set, but not with the equivalent setTraversalAfter. It's not entirely clear why this is, but I'm going with this to at least get it fixed for apps we know about. Fixes #14600
Dart SDK dependency
The Dart SDK is downloaded from one of the supported channels,
cached in bin/cache/dart-sdk and is used to run Flutter Dart code.
The file bin/internal/dart-sdk.version determines the version of Dart SDK
that will be downloaded. Normally it points to the dev channel (for example,
1.24.0-dev.6.7), but it can also point to particular bleeding edge build
of Dart (for example, hash/c0617d20158955d99d6447036237fe2639ba088c).