Font rendering problem in preview for android development

Screen Shot 2558-04-23 at 6.13.03 AM.png
[Click Image to see better resolution]

The font rendering problem appear in Preview window and ToolTip [Thail Font] which not happen in [XML] or [Code Editor].

This is make me headache in UI design becuase I have to run on Emulator or Android devices for see a correct one.

Please fixed it or if it has any fixed please advice

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Environment Information
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Screen Shot 2558-04-23 at 6.10.42 AM.png
Screen Shot 2558-04-23 at 6.08.46 AM.png

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