fix checkbox erratic behavior in some cases
fix checkbox erratic behavior in some cases

RavenB/commafeed,Athou/commafeed,wesley1001/commafeed,Hubcapp/commafeed,wesley1001/commafeed,tlvince/commafeed,zhangzuoqiang/commafeed,ahmadassaf/CommaFeed-RSS-Reader,syshk/commafeed,wesley1001/commafeed,Hubcapp/commafeed,RavenB/commafeed,Athou/commafeed,syshk/commafeed,RavenB/commafeed,ebraminio/commafeed,ahmadassaf/CommaFeed-RSS-Reader,zhangzuoqiang/commafeed,wesley1001/commafeed,Athou/commafeed,zhangzuoqiang/commafeed,Hubcapp/commafeed,zhangzuoqiang/commafeed,ebraminio/commafeed,ebraminio/commafeed,ahmadassaf/CommaFeed-RSS-Reader,ahmadassaf/CommaFeed-RSS-Reader,tlvince/commafeed,tlvince/commafeed,RavenB/commafeed,ebraminio/commafeed,tlvince/commafeed,Athou/commafeed,Hubcapp/commafeed,syshk/commafeed,syshk/commafeed