In getFlutterRoot(), scripts loaded via data: URIs are URI encoded.
getFlutterRoot() scans the contents of the data for the file:// URI path
of the Flutter SDK, which itself is URI-encoded. The end result is that
if the SDK path contains a space, the embedded file:// URI will contain
a %20. When this is encoded in a data: URI, the contents are
URI-encoded, resulting in %2520, since the % is encoded to %25.
This patch decodes the data: URI before extracting the SDK file:// URI.
The Flutter engine now supports package: and file: imports that resolve
to paths on disk that include spaces and other URI-escaped characters.
This patch eliminates the restriction that Dart source paths not include
%20 (or other URI-escaped characters) in their paths in flutter_tool
tests.
1. Add matchers for the `ProcessExit` exception class
2. Add ability to control the setup of the `AppContext` we use in
`testUsingContext()`
3. Clean up the code that figures out the location of `Cache.flutterRoot`
such that it works with `pub run test`. It previously only worked
when the tests were invoked with standalone `dart`
`#3` above will also help unblock #7941
- [x] Introduce DependencyChecker which can determine if any dependencies have been modified.
- [x] Move the DartDependencyBuilder into a separate file.
- [x] Add unit tests for DartDependencyBuilder.
- [x] Add unit tets for DependencyChecker
Part of #7014
* Remove the workaround that pinned args to v0.13.6
This reverts most of the changes in commit 6331b6c8b5
* throw exception if exit code is not an integer
* rework command infrastructure to throw ToolExit when non-zero exitCode
* convert commands to return Future<Null>
* cleanup remaining commands to use throwToolExit for non-zero exit code
* remove isUnusual exception message
* add type annotations for updated args package
