Change substr to at method for character comparison in is_hidden
Change substr to at method for character comparison in is_hidden

clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch