See: https://jsfiddle.net/tq81x81n/
This’s the minimal example based on previous ones demonstrating collapseAll().
It’s running latest version of handsontable (pro//bower_components/).
To see the correct, expected behavior:
delete
columnSorting: true,
This will result in all headers collapse.
However, with
columnSorting: true,
On, the plus sign will be displayed as if those headers are collapsed but none of them actually are.
Tested in latest ver of both chrome & ffox - hoping for a fix or workaround asap.