Reverse toggle order for selection chebox in QTable header

[akahanek]

Hi,
I use QTable with selection="multiple". When only some rows are selected, the selection checkbox in the table header is in indeterminate state. After clicking on this checkbox, the value of this checkbox become false and all selection checkboxes for every row are unchecked.

Is there any chance to reverse the "toggle-order" and set it to "tf" so that all selection checkboxes are checked in such case?

Thank you for any hints.
Ales