When filtering entry levels are not being dropped in the output

[maxwellfundi]

Describe the bug
When I have a dataset with say 4 levels of a factor, then i do say a summary of all the variables, then I do a filter say to have three of the 4 levels, then go back to summaries dialog, I get the same result- The filtered out levels are not dropped after filtering.

Expected behaviour
Filtered out variables should be dropped when doing consecutive operations.