title: How do I create a multi-select header filter in tabulator?
body: <p>This question has been asked several times in various forms over the years in the Tabulator GitHub repository. Here are a few instances:
  <a href="https://github.com/olifolkerd/tabulator/issues/527" rel="nofollow noreferrer">https://github.com/olifolkerd/tabulator/issues/527</a>, <a href="https://github.com/olifolkerd/tabulator/issues/1759" rel="nofollow noreferrer">https://github.com/olifolkerd/tabulator/issues/1759</a></p>
  
  <p>I'm looking for an example of how to achieve this using a dropdown menu of some form --- ideally as described in #1759 (dropdown with checkboxes) but another solution that would work for us is a "select" editor that adds/removes CSVs in the header filter when a value is selected/deselected (extending on the example provided in #527).</p>
  
  <p>Hopefully someone with experience working with custom header filters / editors in tabulator can provide an example of a multi-select header filter dropdown, but if not, then I will post a JSFiddle link myself once I've got something that works.</p>