message: Use MARGIN_TIGHT constant to pad ListBox line height
diff: @@ -29,7 +29,7 @@ ListBox::ListBox() :
  mSlider.change().connect(this, &ListBox::slideChanged);
  _updateItemDisplay();
  - mLineHeight = static_cast<unsigned int>(mFont.height() + 2);
  + mLineHeight = static_cast<unsigned int>(mFont.height() + constants::MARGIN_TIGHT);
  mLineCount = static_cast<unsigned int>(mRect.height) / mLineHeight;
  _updateItemDisplay();
  }
  