message: Simplify positioning of ComboBox text field
diff: @@ -79,7 +79,7 @@ void ComboBox::resizedHandler(Control* /*control*/)
  void ComboBox::repositioned(float, float)
  {
  btnDown.position(positionX() + width() - btnDown.width(), positionY());
  - txtField.position(positionX(), positionY());
  + txtField.position(position());
  lstItems.position(positionX(), positionY() + height());
  mBaseArea = {positionX(), positionY(), width(), btnDown.height()};
  