How to use

invalidateTextPresentation

method

in

org.eclipse.jface.text.TextViewer

/**
 * Initializes the text widget with the visual document and
 * invalidates the overall presentation.
 */
private void initializeWidgetContents() {
  if (fTextWidget != null && fVisibleDocument != null) {
    // set widget content
    if (fDocumentAdapter == null)
      fDocumentAdapter= createDocumentAdapter();
    fDocumentAdapter.setDocument(fVisibleDocument);
    fTextWidget.setContent(fDocumentAdapter);
    // invalidate presentation
    invalidateTextPresentation();
  }
}

/**
 * Initializes the text widget with the visual document and
 * invalidates the overall presentation.
 */
private void initializeWidgetContents() {
  if (fTextWidget != null && fVisibleDocument != null) {
    // set widget content
    if (fDocumentAdapter == null)
      fDocumentAdapter= createDocumentAdapter();
    fDocumentAdapter.setDocument(fVisibleDocument);
    fTextWidget.setContent(fDocumentAdapter);
    // invalidate presentation
    invalidateTextPresentation();
  }
}

@Override
protected void configureTextViewer(final TextViewer textViewer) {
  if (textViewer instanceof SourceViewer) {
    if (fColorManager == null)
      fColorManager = ColorManager.getDefault();
    final XMLConfiguration configuration = new XMLConfiguration(fColorManager);
    textViewer.getControl().addDisposeListener(e -> configuration.dispose());
    IPropertyChangeListener propertyChangedListener = event -> {
      // the configuration will test if the properties affect the presentation also,
      // but checking it here allows us to prevent the viewer from being invalidated
      // and saves some unnecessary work
      if (configuration.affectsColorPresentation(event) || configuration.affectsTextPresentation(event)) {
        configuration.adaptToPreferenceChange(event);
        textViewer.invalidateTextPresentation();
      }
    };
    PDEPlugin.getDefault().getPreferenceStore().addPropertyChangeListener(propertyChangedListener);
    if (fPropertyChangedListeners == null)
      fPropertyChangedListeners = new ArrayList<>(3);
    fPropertyChangedListeners.add(propertyChangedListener);
    ((SourceViewer) textViewer).configure(configuration);
    Font font = JFaceResources.getFont(PluginContentMergeViewer.class.getName());
    if (font != null)
      ((SourceViewer) textViewer).getTextWidget().setFont(font);
  }
}