[TYPO3-core] RFC #9774: Incorrect validation of allowed classes in RTE transformation

[Stanislas Rolland]

This is an SVN patch request.

Type: Bugfix

Bugtracker references:
http://bugs.typo3.org/view.php?id=9774

Branches:
4.2 and trunk

Problem:
Class validation by the default RTE transformation is incorrect:
1. validation of class attribute is case-insensitive;
2. if the class attribute specifies more than one class, the attribute 
is considered invalid and removed.

Solution:
1. Validate class names without applying upper-casing;
2. Remove from the attribute only thoses classes which are not allowed. 
Remove the attribute only if no allowed class was found.

Regards,
Stanislas
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