I just did a quick test in the Database Painter. When you view a Table's data contents the Results data area is really using a DW Object.
The steps I did ...
1) Retrieve data
2) Modify a column in a row & tab out
3) Set a filter for the row that was modified (It now disappears - as expected as its in the Filter buffer).
4) Press the SAVE on the DB Painter's toolbar (uses Update method internally).
5) Retrieve data
6) Remove the Filter
7) The modified column's new value is present => therefore the Update must have worked on the Filter buffer!
Validated:
PB 12.6: OK
PB 12.5.1: OK
PB 12.1: OK
HTH