This ruler does not have a a visual representation of its own. The presentation comes from the configurable list of vertical ruler columns. Such columns must implement the {@link org.eclipse.jface.text.source.IVerticalRulerColumn}. interface.
Clients may instantiate and configure this class.
@see org.eclipse.jface.text.source.IVerticalRulerColumn @see org.eclipse.jface.text.ITextViewer @since 2.0
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