tags-search does not work on compressed tags file

[Philippe Waroquiers]

In GNU Emacs 21.1.2 (hppa1.1-hp-hpux11.00, X toolkit)

to reproduce:
cd /tmp
echo 'int var;' > tagged.c
gzip tagged.c
etags tagged.c
emacs --no-init-file --no-site-file
M-x load-library jka-compr
M-x visit-tags-table TAGS
M-x tags-search a

=> this produces an error message:
next-file: Opening input file: no such file or directory, /tmp/tagged.c
(same behaviour for tags-query-replace)

-- 
Philippe WAROQUIERS                  Eurocontrol - Central Flow Management Unit
philippe.waroquiers@eurocontrol.int  Rue de la fusee, 96
Tel: +32 2 729 97 35                 1130 Brussels
Fax: +32 2 729 90 22                 Belgium