Ps：The letter 'ரி' is composed by two unicode letter 'ர' and 'ி'. It's special in Tamil language. After they composed, they can not be separated. Because the 'ி' is no meaning.
If you are using 4.1 and Spark TextArea, plase file a bug.
I am using 3.5 now ...
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Upgrade to 4.1 and try the Spark TextArea. TextField-based text controls
may not handle certain characters well.