On the bright side, it solves the build issue when the current user doesn't have the permission for symbolic links.

On the other side, it makes everything much slower ...
On top of that, the incremental build is broken when running tests with watchers (both test.unit.js and test.unit.dart tasks), i.e. files modifications are not taken into account. Note that this is not a new issue introduced by this PR.

So LGTM but the limitations should be documented in the developer guide.

You're right... incremental builds will still not work with this patch. I've uploaded a new version with the developer guide's note and also refactored a little bit the copyRecursiveSync method.

Thank you!

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