FSFileBackendDirList.php

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<?php
class FSFileBackendDirList extends FSFileBackendList {
    protected function filterViaNext() {
        while ( $this->iter->valid() ) {
            if ( $this->iter->current()->isDot() || !$this->iter->current()->isDir() ) {
                $this->iter->next(); // skip non-directories and dot files
            } else {
                break;
            }
        }
    }
}