message: Simplify setting mRect from mBaseArea in ComboBox
diff: @@ -104,13 +104,13 @@ void ComboBox::onMouseDown(EventHandler::MouseButton button, int x, int y)
  }
  else
  {
  - mRect = {mBaseArea.x(), mBaseArea.y(), mBaseArea.width(), mBaseArea.height()};
  + mRect = mBaseArea;
  }
  }
  else if (!lstItems.rect().contains(Point{x, y}))
  {
  lstItems.visible(false);
  - mRect = {mBaseArea.x(), mBaseArea.y(), mBaseArea.width(), mBaseArea.height()};
  + mRect = mBaseArea;
  }
  }
  