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   The following modifiers are accepted after a “+” or “-”:

   o      A / specifies that the include/exclude rule  should  be  matched
          against the absolute pathname of the current item.  For example,
          “-/ /etc/passwd” would exclude the  passwd  file  any  time  the
          transfer  was  sending  files from the “/etc” directory, and “-/
          subdir/foo” would always exclude “foo” when it is in a dir named
          “subdir”,  even if “foo” is at the root of the current transfer.

Hence, your dir-merge setup causes only the absolute path /tmp/ to be
excluded. If you want to exclude /data/home/andy/tmp/ then put that in
your .rsync-filter .

The leading slash behaves differently in a dir-merge rule than in a
"normal" include file.

At least, that's how I read the manpage :-)


Paul