背包分区：类别页签的切换过滤

-- 错误：切页签重排背包数据，格子位置漂移
function pickTab(tab)
    table.sort(bag, function(a, b)
        return a.kind == tab
    end)
end

local function showTab(tab)
    clearRows()
    for _, it in ipairs(bag) do
        if tab == "all" or it.kind == tab then
            appendRow(it)
        end
    end
end
local function pickTab(name)
    current = name
    showTab(name)
end