func SplitText returns a wrong result

[long-z-code]

pdf.SetFont("msyh", "", 12)
fmt.Println(pdf.SplitText("你好哈哈哈哈哈哈哈哈哈哈哈啊哈哈啊哈哈哈哈哈", 95))
output: 你好哈哈哈哈哈哈哈哈哈哈哈啊哈哈啊哈哈哈哈
result is missing a chinese word '哈' when i use msyh.ttf

[long-z-code]

i think the problem is func isChinese(c)
chinese words should not be the same as space words