Cleanup of postbox_classes

[logikal16]

When using add_meta_box, this patch fixes the extra spaces in the meta box CSS class attribute.

This patch cleans up the postbox_classes function.

[nacin]

I'm not sure why some code here has been removed. What about the $_GET['edit'] checks?

It'd be easier if we just imploded and trim() at the end, and convert those kind-of empty arrays to array().

[logikal16]

@nacin - Look at the code more closely. The line with $_GETedit? is useless. It sets $classes to a 1-element array (which the code does in 3 other instances).

It'd be easier to set the default value as an empty array, then add more classes as needed (as the patch provides).

[logikal16]

Any updates?

[c3mdigital]

Closing as maybe later. See: ​http://make.wordpress.org/core/2011/03/23/code-refactoring/