Re: etags: M-. looks for an uncompressed Emacs Lisp source file, but make install installs it gzipped

[Francesco Potorti`]

>I did it (so *disabling* auto-compression mode), and Emacs actually
>changed behavior

I did a simpler test case (a single gzipped source file).  I observe the
same behaviour as yours plus this curious thing.  To reproduce:

- cd in a dir where you have a C source file emacs.c
- etags emacs.c
- gzip emacs.c

Now:
- emacs -q
- M-. main RET
- RET --> file emacs.c not found

While:
- emacs -q
- M-x auto-compression-mode RET
- M-x auto-compression-mode RET
- M-. main RET
- RET --> tag is found

So, disabling and reenabling auto-compression-mode solves the problem if
done at the beginning, while mixing things as Luca did causes different
behaviour.