in lib/primer/view_components/linters/two_column_layout_migration_counter.rb [116:130]
def container_from(columns_tag_tree)
columns = columns_from(columns_tag_tree)
return unless columns.size == 2
container = Container.new(columns)
main_min = container.main.widths.min_value
sidebar_min = container.sidebar.widths.min_value
return unless sidebar_min && main_min
return unless WIDTH_RANGE.include?(main_min)
return unless SIDEBAR_WIDTH_RANGE.include?(sidebar_min)
container
end