When serializing to OLX, the Learning Core runtime wraps HTML content in CDATA to avoid having to escape every individual `<`, `>`, and `&`. The runtime also puts newlines around the content within the CDATA, So, given HTML content `...`, we get `<![CDATA[\n...\n]]>`. The problem is that every time you serialize an HTML block to OLX, it adds another pair of newlines. These newlines aren't visible to the end users, but they do make it so that importing and exporting content never reached a stable, aka "canonical" form. It also makes unit testing difficult, because the value of `html_block.data` becomes a moving target. We do not believe these newlines are necessary, so we have removed them from the `CDATA` block, and added a unit test to ensure that HTML blocks having a canonical serialization. Closes: https://github.com/openedx/edx-platform/issues/35525
Open edX -------- This is the root package for Open edX. The intent is that all importable code from Open edX will eventually live here, including the code in the lms, cms, and common directories. If you're adding a new Django app, place it in core/djangoapps. If you're adding utilities that require Django, place them in core/djangolib. If you're adding code that defines no Django models or views of its own but is widely useful, put it in core/lib. Note: All new code should be created in this package, and the legacy code will be moved here gradually. For now the code is not structured like this, and hence legacy code will continue to live in a number of different packages.