file properties cache

[Ted Zlatanov]

Tramp 2.1.8-pre (from CVS)

When I open a file remotely, its properties (specifically, read-only)
are cached.  If the attributes are changed on the remote system, I
still can't open that file for editing because the properties are
cached.  I've coped by clearing the tramp-cache, but perhaps there
should be a command to clear the cache for the file currently visited,
and that command should be (optionally) executed when the buffer is
closed (e.g. with kill-this-buffer).

If there's a better workaround, please let me know; otherwise I can
implement these two items.

Thanks
Ted