Implicit restriction on the name of ROOT directory

[nh7a]

There is an implicit restriction on the name of ROOT directory for Wordpress due to a simple bug in wp-includes/classes.php.

For example, if your ROOT directory is, say, "/en" and Permalinks configuration is other than default (so that Rewrite check will happen), you cannot use Input Field Settings of cforms because $req_uri, which the AJAX URL used by cforms, say, /en/wp-content/plugins/cforms/js/include/textfield.php, won't match to $self, which will mistakenly be wp-contt/plugins/cforms/js/include/textfield.php. Notice wp-contt should be wp-content.

A patch to the bug

Looking at [3370], it seems that line should have been removed with that changeset. The patch looks good. I'll test it out on a few different setups since changes to this area can cause high impact breakage.

(In [7551]) Remove unanchored string replacement. Props nh7a. fixes #6423