Combo box very slow for Thai language data.

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<div>Hi....</div>
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<div>Sorry if I use wrong English.</div>
<div>I found that the combo box with drop down list will be very slow when click 
the combo box, the drop down list need a few second to show if the data on the 
list was Thai language. But the English data was no problem. </div>
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<div>This problem occur after PyQt version 4.8.6.</div>
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<div>I use 64 bits windows 7, python 3.2.3, eric5 5.2.3 with database mysql 5. 
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<div>Regards,</div>
<div>Sukit Taweesap.</div>
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