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It is possible to create a completable XBlock with children. An example is the Library Content Block with the `MARK_LIBRARY_CONTENT_BLOCK_COMPLETE_ON_VIEW` feature toggle. The sidebar should use the same mechanism as the `BlockCompletionTransformer` and the `edx-completion` library. It means that we should treat: 1. An aggregator XBlock as completed only when all its children are completed. 2. A completable XBlock as completed when it is directly marked as completed (without checking the completion of its children).
LMS (Learning Management System) -------------------------------- This directory contains code relating to the student portal for edX.