I am using 6.0.1 (build 5784) to manage a facelets project. I created a tag file and mapped it to a custom tag. I also am using the same file as an include file uisng <ui:include>. I pass a parameter to the custom tag as an attribute or the include file using <ui:param>. So far so good, everything works when I deploy and run the application.
The problem occurs when editing the tag/include file. IntelliJ doesn't know about the parameter (since it is not registered as a backing bean) so I get the dreaded red squiggle and "Cannot resolve variable xyzzy" whenever I reference the parameter in EL expressions.