This shouldn't be required I think based on what's in getLabel(). Think you can look to see why that line isn't working?

getlabel adds class to the label, but mootols validate.js only looks in the input fields. - https://github.com/klas/joomla-cms/blob/0c8effd77dbf2f120416363583cab0154731d3da/media/system/js/validate-uncompressed.js#L72

Validate will work for those extensions using jquery validation, but not for those still on mootols version, also a lot of older custom validators work on inputs, so to maintain backwards compatibility required class should be added to inputs until mootols is supported.

Thanks for the info.

Thanks for your contribution - At this time we are only using github as the place to submit code fixes, the actual reporting of issues and testing fixes is still taking place on Joomlacode.

Please can you:

1) Open an item on the Joomlacode tracker in the appropriate area.

CMS Bug Reports: http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemBrowse&tracker_id=8103

CMS Feature Requests: http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemBrowse&tracker_id=8549

2) After submitting the item to the Joomlacode tracker, add a link to the Joomlacode tracker item here and make sure that you add a link to this GitHub issue or pull request on the joomlacode tracker item.

http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_id=8103&tracker_item_id=32577

This has been superseded by #2690 which has updated it to the new JForm code in 3.2. Thanks for your contribution!