Bug 5832 Template Pref page: Edit: Copy/paste context menu
The text field to edit the templates should have a context menu with copy/paste.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/EditTemplateDialog.java
private static GridData getButtonGridData(Button button) {
		GridData data= new GridData(GridData.FILL_HORIZONTAL);
		data.heightHint= SWTUtil.getButtonHeigthHint(button);
	
		return data;
	}
	private static Label createLabel(Composite parent, String name) {
		Label label= new Label(parent, SWT.NULL);
		label.setText(name);
		label.setLayoutData(new GridData());
		return label;
	}
	private static Text createText(Composite parent) {
		Text text= new Text(parent, SWT.BORDER);
		text.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));		
		
		return text;
	}
	private SourceViewer createEditor(Composite parent) {
		SourceViewer viewer= new SourceViewer(parent, null, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
		JavaTextTools tools= JavaPlugin.getDefault().getJavaTextTools();
		viewer.configure(new SimpleJavaSourceViewerConfiguration(tools, null));
		viewer.setEditable(true);
		
		IDocument document= new Document();
		document.addDocumentListener(new IDocumentListener() {
			public void documentAboutToBeChanged(DocumentEvent event) {}
			public void documentChanged(DocumentEvent event) {
				fInterpolator.interpolate(event.getDocument().get(), fVerifier);
				updateButtons();