Bug 60258 jface.text templates uses extension registry
jface.text templates support (TemplateStore) is using the Eclipse extension registry. In the past, jface text, like jface, was independent of the Eclipse plug-in mechanism and extension registry. Is this change intentional?
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/CodeTemplateBlock.java
if (fSWTWidget != null) {
			return fSWTWidget.getShell();
		}
		return JavaPlugin.getActiveWorkbenchShell();			
	}	
	
	private SourceViewer createViewer(Composite parent, int nColumns) {
		Label label= new Label(parent, SWT.NONE);
		label.setText(PreferencesMessages.getString("CodeTemplateBlock.preview")); 
		GridData data= new GridData();
		data.horizontalSpan= nColumns;
		label.setLayoutData(data);
		
		IDocument document= new Document();
		JavaTextTools tools= JavaPlugin.getDefault().getJavaTextTools();
		tools.setupJavaDocumentPartitioner(document, IJavaPartitions.JAVA_PARTITIONING);
		IPreferenceStore store= JavaPlugin.getDefault().getCombinedPreferenceStore();
		SourceViewer viewer= new JavaSourceViewer(parent, null, null, false, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL, store);
		TemplateEditorSourceViewerConfiguration configuration= new TemplateEditorSourceViewerConfiguration(tools.getColorManager(), store, null, fTemplateProcessor);
		viewer.configure(configuration);
		viewer.setEditable(false);
		viewer.setDocument(document);
	
		Font font= JFaceResources.getFont(PreferenceConstants.EDITOR_TEXT_FONT);
		viewer.getTextWidget().setFont(font);
		new JavaSourcePreviewerUpdater(viewer, configuration, store);
		
		Control control= viewer.getControl();
		data= new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.FILL_VERTICAL);
		data.horizontalSpan= nColumns;