How to detect unselect from filter

Hi,

I am not able to find the way how to detect event of unselecting when I use filter and part of data is selected

To reproduce:
1. "Multi select" from https://akveo.github.io/ng2-smart-table/#/examples/various
2. Select few rows with checkboxes on left
3. Apply filter on first column, eg '1'
4. Selection is lost BUT (rowSelect)=".." neither (userRowSelect)=".." is NOT triggered

Could you please point me to right direction how to handle this case?

Thanks,
Michal