Bug 43228 Encoding Support for Java editor broken
I20030916 This has been broken with the introduction of ExtendedTextEditor.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
if (line != null && line.length() > 0) {
			ISourceViewer sourceViewer= getSourceViewer();
			if (sourceViewer != null) {
				int lineOffset;
				if (sourceViewer instanceof ITextViewerExtension3) {
					ITextViewerExtension3 extension= (ITextViewerExtension3) sourceViewer;
					lineOffset= extension.widgetOffset2ModelOffset(widgetLineOffset);
				} else {
					IRegion visible= sourceViewer.getVisibleRegion();
					lineOffset= visible.getOffset() + widgetLineOffset;
				}
				try {
					return getBidiLineSegments(sourceViewer, lineOffset);
				} catch (BadLocationException x) {
					
				}
			}
		}
		return null;
	}
	
	/*
	 * Update the hovering behavior depending on the preferences.
	 */
	private void updateHoverBehavior() {
		SourceViewerConfiguration configuration= getSourceViewerConfiguration();
		String[] types= configuration.getConfiguredContentTypes(getSourceViewer());
		for (int i= 0; i < types.length; i++) {
			
			String t= types[i];