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fixes #464
the width of multiline text lable is the sum of each line's width
After:
![image](https://user-images.githubusercontent.com/23057110/57390325-aa032a00-71ee-11e9-82ca-190b9fb17f55.png)
Before:
![image](https://user-images.githubusercontent.com/23057110/57390366-c0a98100-71ee-11e9-8a70-d4a345e3272d.png)