Idea 9678 and squiggles in facelets

I use ui:include to include a xhtml page into another page. In the included page, all jsf tags (h:commandLink, a4j:commandLink ....) have squiggles under them. The message from Idea is:

Checks JSF component tags to be located under view or subview tag. The validation works in jsp or jspx file types.

Is the way I'm using ui:include (or the way I write the included xhtml files) not standard?