GroupConfig.fold constructor
      
      GroupConfig.fold(
    
- List<
GroupConfig> configs 
Merges all provided configs, with first nonNull value for each parameter.
Provide configs in the order of priority.
Implementation
GroupConfig.fold(List<GroupConfig> configs)
    : labelBarSpace =
          configs.map((_) => _.labelBarSpace).nonNulls.firstOrNull,
      interBarSpace =
          configs.map((_) => _.interBarSpace).nonNulls.firstOrNull,
      label = configs.map((_) => _.label).nonNulls.firstOrNull;