`data` is missed for multi level grouping

Describe the bug When I use multi level grouping the data parameter is empty array. For one level group there is data as expected

Tabulator Info

• Which version of Tabulator are you using? 4.2

  groupBy : function( data ){ return data.agreement_id +'-' + data.period_id },
  groupHeader : function( value, count, data, group ){
    console.log( data );
    return 'asdf';
  },

For multi level:

  groupBy : [ 'agreement_id', 'period_id' ],
  groupHeader : [ function( value, count, data, group ){
    console.log( data );
    return 'asdf';
  }, function( value, count, data, group ){
    console.log( data );
    return 'asdf';
  } ],

It seems for multi level grouping there is two extra dummy calls and once after the real row:

The table:

Also documentation does not mention forth parameter: group

[tentus]

It sounds to me like you’re calling getSubGroups on a Group, not a GroupComponent that you link to. The latter wraps a call to the former, forcing the return array to be the child components rather than the children directly.

[jots]

Thanks. I ended up using the workaround described at #2145. I do think the data field should not be empty for top level groups if multi level grouping is used, but I understand that’s subjective.