scrollUpItem
fun scrollUpItem(line: MutableProvider<Int>, on: ItemProvider = DefaultGuiItems.TP_ARROW_UP_ON.clientsideProvider, off: ItemProvider = DefaultGuiItems.TP_ARROW_UP_OFF.clientsideProvider): Item
A UI item for scroll guis that decrements line on left-click. Uses on as item provider if it is possible to scroll up, otherwise uses off.
A UI item for scroll guis that decrements line on left-click. Uses itemProvider as item provider.