private void updateColumnWidthImpl(Column<T, ?> column, String width) {
        int columnCount = getColumnCount();
        for (int i = 0; i < columnCount; i++) {
            if (columns.get(i) == column) {
                doSetColumnWidth(i, width);
            }
        }
    }
Update the width of all instances of the specified column. A column
instance may appear multiple times in the table.

@param column the column to update
@param width  the width of the column, or null to clear the width
stroom-core-client-widget/src/main/java/com/google/gwt/user/cellview/client/AbstractCellTable.java