public void setScrollMargin(final int top, final int bottom, final int left, final int right) {
        this.scrollMarginDirty = true;
        scrollMargin = new Rect(top, bottom, left, right);
        updateScrollMargin();
    }
@param lineNo One based
@param colNo  One based
stroom-core-client-widget/src/main/java/stroom/editor/client/view/Editor.java