Fix parsing of square bracket characters in IMAP response strings (#1489223)

Aleksander Machniak

2013-07-04 88e49b37f71f1a69e88952e8938cb5c6cb19630f

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.panel_wrapper {height:85px;} 
.panel_wrapper div.current {height:85px;} 
 
/* IE */ 
* html .panel_wrapper {height:100px;} 
* html .panel_wrapper div.current {height:100px;}