Re: `file-relative-name' for compressed files

[Richard Stallman]

    The local-changes-only alternative consists of changing
    file-relative-name to ignore jka-compr when searching for a handler
    (by incorporating Emilio's patch), and to change Tramp to use a longer
    regexp in file-name-handler-alist.

    The second alternative is to make file-relative-name into a file
    operation.  Then jka-compr and Tramp can each do the right thing.

I suggested another alternative which is cleaner than either of these,
if it works:

   Perhaps making the file-remote-p operation
 return more information is the way to do it.  For instance, it could
 return the "remote part" of the file name.

Could you please see if you can solve it that way?