Comments CSS-Classnames aren't properly assigned in get_comment_class()

[hakre]

the function get_comment_class() (/wp-includes/comment-template.php) has a little flaw in adding class names to the class array. this can lead to problems if filter want to check for a specific classname in the classes-array.

it can be easily fixed. this will prevent plugin authors and theme designers to create complicated hotfix code.

the supplied patch fixes this behaviour for the byuser classname being in one with the comment-author-... .

[hakre]

byuser now in it's own array entry. fixes problems with getting un-normalized data.

[westi]

(In [10875]) Move byuser to a seperate array entry to ease filtering by plugins. Fixes #9465 for trunk props hakre.

[westi]

Reopen for 2.7 branch

[automattor]

(In [10876]) Move byuser to a seperate array entry to ease filtering by plugins. Fixes #9465 for 2.7 branch props hakre.

[hakre]

see #8446