|arg desc 4 = The item stacks whose quantity changed. Each <tt>ItemStackSizeChange</tt> instance includes <tt>Item</tt> (the affected item stack), <tt>OldSize</tt> (the previous stack size), and <tt>NewSize</tt> (the new stack size). | |arg desc 4 = The item stacks whose quantity changed. Each <tt>ItemStackSizeChange</tt> instance includes <tt>Item</tt> (the affected item stack), <tt>OldSize</tt> (the previous stack size), and <tt>NewSize</tt> (the new stack size). |