message: Fix sign conversion warning in ComboBox
diff: @@ -166,7 +166,7 @@ void ComboBox::addItem(const std::string& item, int tag)
  lstItems.addItem(item, tag);
  if (lstItems.count() > mMaxDisplayItems) { return; }
  - lstItems.height(static_cast<int>(lstItems.count()) * lstItems.lineHeight());
  + lstItems.height(static_cast<int>(lstItems.count() * lstItems.lineHeight()));
  lstItems.clearSelection();
  }
  