表情面板：常用表情的快捷选用

-- 错误：每次打开全量渲染几百个表情
function openEmoji()
    renderAll(ALL_EMOJI)
end

local used = {}
local function pickEmoji(id)
    used[id] = (used[id] or 0) + 1
    sendEmoji(id)
    refreshHot()
end
local function refreshHot()
    local keys = {}
    for k in pairs(used) do
        keys[#keys + 1] = k
    end
    table.sort(keys, function(a, b)
        return used[a] > used[b]
    end)
    fillHotPanel(keys)
end