说明：在窗口中重绘时避免闪烁的类，非常有效，解决让用户觉得闪烁的感觉。
Redraw the window to avoid flicker of the class, very effective solution that allows users to flash the feeling...
说明：在窗口中重绘时避免闪烁的类，非常有效，解决让用户觉得闪烁的感觉。
Redraw the window to avoid flicker of the class, very effective solution that allows users to flash the feeling...
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