Priority ignored in 6+ EM
The priority flag is ignored by the TYPO3 CMS 6.0+ Extension Manager. Although seldom used it exists, is quite convenient and should be respected.
As a reminder, that flag may take values "top" or "bottom". A "top" extension should always be installed first, a "bottom" extension always last.
Updated by Andreas Kiessling about 8 years ago
I would not say, this is a seldomly used feature. gridelements e.g. uses this flag, so that the fields for the container column are added to all new content elements.
With the wrong load order, adding "new" content elements in a grid container fails (CTypes from extensions loaded after gridelements), because the needed field can not be set. So IMHO this needs to be tackled soon!