/*
  * Gets the preferred size for QTextEdit client area
  */
 private Point getPreferredClientAreaSize(int wHint) {
   Point size = OS.QTextEdit_swt_preferredClientSize(topHandle, wHint);
   if (size == null) return new Point(WidgetConstant.DEFAULT_WIDTH, WidgetConstant.DEFAULT_HEIGHT);
   if (size.x < 0) size.x = WidgetConstant.DEFAULT_WIDTH;
   if (size.y < 0) size.y = WidgetConstant.DEFAULT_HEIGHT;
   return size;
 }