@Override
    public void dispose()
    {
        super.dispose();
        nestedCount--;
    }
Nested SQL editor contributor.
It is really nested if more than one contributor exists at the same time.
Otherwise it should act as normal contributor
plugins/org.jkiss.dbeaver.ui.editors.sql/src/org/jkiss/dbeaver/ui/editors/sql/SQLEditorContributorNested.java