public ColumnBasedTableFilter<ROW_OBJECT> getColumnTableFilter() {
		return columnFilterManager.getCurrentFilter();
	}
Returns the ColumnTableFilter that has been set on this GTableFilterPanel or null if there
is none.

@return the ColumnTableFilter that has been set.
Ghidra/Framework/Docking/src/main/java/docking/widgets/table/GTableFilterPanel.java