如图，labelttf为什么在dddddddddd这些字符直接换到下一行了
测试代码:
local data = “测试字符串dddddddddddddddddddddddddddddddddd哈哈哈哈ddddddddddddddd…”
local lbl = CCLabelTTF:create(a2u(data), DefaultFontName, 22)
local textsize = lbl:getTxtBound()
local dimensions = CCSizeMake(limitW,textsize.height * 2)
lbl:setDimensions(dimensions)
lbl:setHorizontalAlignment(kCCTextAlignmentLeft)
lbl:setColor(ccc3(255,255,0))
self:addChild(lbl)