As admin, under admin/filters.php enable Code highlighter filter make sure the site or user's preferred editor is set to TinyMCE activate filter_codehighlighter in a course create a question, whichever type and add a code block from the Tiny editor set the code block as Python language (surround the <code> tags with <pre class="language-python"> ) and add some Python code within the code block, add a Python comment, i.e. a line starting with a hash sign save and preview the question   Result before the patch: the comments within the code block are displayed with a green background and padding, such as in the picture linked to this issue. Result after the patch: the comments within the code block are displayed in grey, without any background nor padding.

Code verified against automated checks. Checked MDL-85440 using repository: https://github.com/ndunand/moodle main (0 errors / 0 warnings) [branch: wip-MDL-85440 | CI Job ] More information about this report Built on: Tue May 13 05:40:01 UTC 2025

Launching automatic jobs for branch MDL-85440 -405 https://ci.moodle.org/view/Testing/job/DEV.02%20-%20Developer-requested%20PHPUnit/19321/ PHPUnit (sqlsrv) --> unrelated, please ignore. https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/66022/ Behat (NonJS - boost and classic) https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/66023/ Behat (Firefox - boost) Launching automatic jobs for branch MDL-85440 -500 https://ci.moodle.org/view/Testing/job/DEV.02%20-%20Developer-requested%20PHPUnit/19323/ PHPUnit (sqlsrv) https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/66024/ Behat (NonJS - boost and classic) https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/66025/ Behat (Firefox - boost) Launching automatic jobs for branch MDL-85440 https://ci.moodle.org/view/Testing/job/DEV.02%20-%20Developer-requested%20PHPUnit/19324/ PHPUnit (sqlsrv) https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/66026/ Behat (NonJS - boost and classic) https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/66027/ Behat (Firefox - boost) https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/66028/ Behat (Firefox - classic) https://ci.moodle.org/view/Testing/job/DEV.01%20-%20Developer-requested%20Behat/66029/ App tests (stable app version) Built on: Tue May 13 10:17:25 UTC 2025