Tabulator's "editor: 'list'" seems to not honor the tabindex when you press 'Tab' when the select list menu is open.

https://jsfiddle.net/sv95rzy4/3/

To reproduce in the jsfiddle click on 'Alice' in the table then press the 'Tab' key. The menu opens in the Level column. Then press the 'Tab' key again. I would expect the button in the Action column to be selected, but instead the next row's dropdown menu opens.

Here is the code if you can't see the jsfiddle for some reason. I don't think it has anything to do with the fact I am using a formatter for the editor list, but I left it in the example just in case. (If you comment out the formatter the behavior is still the same).

var tableData = [{
    name: "Alice", level: "2", actions: "<button tabindex='0' onclick=\"alert('clicked 1')\">X</button>"},
  { name: "Bob", level: "3", actions: "<button tabindex='0' onclick=\"alert('clicked 2')\">X</button>", },
];

var levels = {  1: 'Pro',  2: 'Advanced',  3: 'Moderate',  4: 'Rookie'
};

var table = new Tabulator("#example-table", {
  height: '100px',
  data: tableData,
  columns: [{
    title: "Name",
    field: "name"
  },{
    title: "Level",
    field: "level",
    editor: "list",
    editorParams: {
      values: levels
    },
    formatter: function(cell, formatterParams, onRendered) {
      var select = document.createElement('select');
      select.style.width = '100%';
      select.innerHTML = '<option>' + levels[cell.getValue()] + '</option>'; 

      return select;
    }
  }, {title: "Actions", field: "actions", formatter: 'html'} ],
});