Method GetNumberRowsLegend

src/smallmap_gui.cpp:775–781

* Get the number of rows in the legend from the number of columns. Those * are at least min_number_of_fixed_rows and possibly more if there are so * many cargoes, industry types or companies that they won't fit in the * available space. * @param columns Number of columns in the legend. * @return Number of rows needed for everything to fit in. */

	 * @return Number of rows needed for everything to fit in.
	 */
	uint GetNumberRowsLegend(uint columns) const
	{
		/* Reserve one column for link colours */
		uint num_rows_linkstats = CeilDiv(_smallmap_cargo_count, columns - 1);
		uint num_rows_others = CeilDiv(std::max(_smallmap_industry_count, _smallmap_company_count), columns);
		return std::max({this->min_number_of_fixed_rows, num_rows_linkstats, num_rows_others});
	}

	/**
	 * Select and toggle a legend item. When CTRL is pressed, disable all other