public void setShowIndentGuides(final boolean showIndentGuides) {
        showIndentGuidesDirty = true;
        this.showIndentGuides = showIndentGuides;
        updateShowIndentGuides();
    }
@param lineNo One based
@param colNo  One based
stroom-core-client-widget/src/main/java/stroom/editor/client/view/Editor.java