public void unindent(StringBuilder indent, int number) {
        CharSequence oneIndent = createIndent();
        for (int k = 0; k < number; k++) {
            int i = indent.lastIndexOf(oneIndent.toString()); //$NON-NLS-1$
            if (i != -1) {
                indent.delete(i, i + oneIndent.length());
            }
        }
    }
Reduces indentation in <code>indent</code> by one indentation unit.

@param indent the indentation to be modified
plugins/org.jkiss.dbeaver.ui.editors.sql/src/org/jkiss/dbeaver/ui/editors/sql/indent/SQLIndenter.java