Custom theme generation is broken

The Custom theme generation process produces bugged *.css files.

1) The common jquery-ui.structure.css (and its minified version) contains the css scope class for all styles and this is uncorrect for the structure because this is the common part of the jquery ui css and there should be no reference to the custom ui theme scope class.

2) The specific theme css file is partially broken as well on certain definitions such as those related to anchors.

Example:

a.custom-theme ... {...}

should be:

.custom-theme a ... {...}