fee4fe8241
This allows navigation to work from migrated files, but some navigation from unmiograted files doesn't work. This also causes the content of the output directory to be deleted before generation starts so that old files won't confuse the user. Change-Id: I0007d811e56b82cb6b91582e3237c7383ae2d060 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/119660 Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>