viewer2.invalidateTextPresentation(fRememberedStyleRange.start, fRememberedStyleRange.length);
viewer2.invalidateTextPresentation(fRememberedStyleRange.start + viewer.getVisibleRegion().getOffset(), fRememberedStyleRange.length);
	private void repairPresentation(ITextViewer viewer) {		if (fRememberedStyleRange != null) {			if (viewer instanceof ITextViewerExtension2) {				// attempts to reduce the redraw area				ITextViewerExtension2 viewer2= (ITextViewerExtension2) viewer;				viewer2.invalidateTextPresentation(fRememberedStyleRange.start, fRememberedStyleRange.length);			} else				viewer.invalidateTextPresentation();		}	}