Setup

1. Create a new Moodle site
2. Ensure that the git repository is checked out to the previous week's release (prior to Atto being removed)
3. Install the site
4. Configure some users to have Atto as their preferred editor (User preferences -> Editor preferences -> Choose Atto)
5. Set the default editor for the site to Atto

Test

1. Make a backup copy of lib/editor/atto
2. Update the codebase to the testing release but DO NOT run the upgrade script
3. Copy your Atto backup to lib/editor/atto
4. Perform the Moodle upgrade
   1. Confirm that the Editor was not uninstalled
5. Pull open the database connection and check:
   1. Confirm that some users still have the atto preference

      SELECT * FROM mdl_user_preferences WHERE name = 'htmleditor';

   2. Confirm that the site preference still mentions Atto

      SELECT * FROM mdl_config WHERE name = 'texteditors';

6. Edit the version.php and bump the version number to tomorrow's date.
   For example, if today is February 5th 2025, you would put:
   2025020600.00
7. Copy this number
8. Edit the upgrade.php
9. Find the upgrade step for the removal of Atto.
10. Change all version references for and in this if block to use the new version number
11. Remove the lib/editor/atto directory
12. Run the upgrade script
13. Pull open the database connection and check:
    1. Confirm that no users have the atto preference

       SELECT * FROM mdl_user_preferences WHERE name = 'htmleditor';

    2. Confirm that the site preference no longer mentions Atto

       SELECT * FROM mdl_config WHERE name = 'texteditors';

    3. Confirm that no Atto plugins remain

       select * from mdl_config_plugins where plugin like '%atto%';

Code verified against automated checks.

Checked MDL-83282 using repository: https://github.com/andrewnicols/moodle.git

• main (0 errors / 0 warnings) [branch: MDL-83282-main | CI Job]

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