[#341] Bound zoom levels into the UI
[#341] Bound zoom levels into the UI

lshift/diffa,lshift/diffa,aprescott/diffa,0x6e6562/diffa,lshift/diffa,lshift/diffa,0x6e6562/diffa,aprescott/diffa,aprescott/diffa,lshift/diffa,0x6e6562/diffa,aprescott/diffa,0x6e6562/diffa