message: Add static_casts to silence conversion warning in ListBoxBase
diff: @@ -157,7 +157,7 @@ void ListBoxBase::onMouseMove(int x, int y, int /*relX*/, int /*relY*/)
  return;
  }
  - mCurrentHighlight = (y - positionY() + mCurrentOffset) / mItemHeight;
  + mCurrentHighlight = (static_cast<unsigned int>(y - positionY()) + mCurrentOffset) / static_cast<unsigned int>(mItemHeight);
  if (static_cast<std::size_t>(mCurrentHighlight) >= mItems.size())
  {
  