Bug 42143 Dialogs for source actions do not use dialog font [dialogs]
select a cu in package explorer context menu "Source": "Override/Implement methods..." "Generate Getters and Setters..." "Generate Delegate methods..." "Add constructor from superclass..." "Generate constructor using fields..."
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/actions/GenerateNewConstructorUsingFieldsAction.java
/* (non-Javadoc)
	 * Method declared on SelectionDispatchAction
	 */
	public void run(IStructuredSelection selection) {
		try {
			IType selectionType= getSelectedType(selection);
			if (selectionType == null) {
				MessageDialog.openInformation(getShell(), getDialogTitle(), ActionMessages.getString("GenerateConstructorUsingFieldsAction.not_applicable")); 
				return;
			}
			IField[] selectedFields= getSelectedFields(selection);
			
			IEditorPart editor= null;
			if (selectedFields != null)
				editor= EditorUtility.openInEditor(selectedFields[0]);
			else
				editor= EditorUtility.openInEditor(getSelectedType(selection).getCompilationUnit());
			if (canRunOn(selectedFields)) {
				run((IType) EditorUtility.getWorkingCopy(selectedFields[0].getDeclaringType()), selectedFields, editor, false);
				return;
			}
			Object firstElement= selection.getFirstElement();
			if (firstElement instanceof IType)
				run((IType) EditorUtility.getWorkingCopy((IType) firstElement), new IField[0], editor, false);
			else if (firstElement instanceof ICompilationUnit) {
				IType type= ((ICompilationUnit) firstElement).findPrimaryType();
				if (type.isInterface()) {
					MessageDialog.openInformation(getShell(), fDialogTitle, ActionMessages.getString("GenerateConstructorUsingFieldsAction.interface_not_applicable")); 					
					return;
				} else