#CKEditor in core

If this gets into 11.2 we can backport through to earlier branches, but adding the tag for additional attention.

Updated the issue summary with the simplest steps to reproduce from #69, proposed resolution and remaining tasks.

The log message text could be the following (1. what triggered the error, 2. how it was resolved automatically, 3. the scope of error) implemented in the manner of the patch from #36

\Drupal::logger('role')->error('Invalid permission detected. Revoked the following invalid permissions: "' . implode('", "', $invalid_permissions) . '".');

It should be decided if role ID and label need to be also added as recommended by @alexpott

Patch #36 solved my issue.

My issue was after I added a new field to a content type with permissions configuration done, then deleted it later, the field is not clean up in the system, the permission was stuck on missing fields and can't save configurations.

Hope this help anyone with the same issue.
Thank you for all the efforts.