When I type on a filter, the event filterChange is fired and it correctly contains the data of the column filter that has been modified, with its value.
The problem is that when a filter is cleared (either via clear button or by emptying the filter), the fired filterChange event does not contain any information. No name of the filter field is provided. This doesn't allow me to know which filter has been cleared.
I have reported the same problem in my ticket Support ID:1651827. :-D