gtags.el: Completion while "Find files:"

[polzin_spamprotect_]

Hi,

thanks for gnu global!

gtags.el enables completion on "tab" only for tag and symbols. I am so
used to completion, that I find myself often removing a "tab" from the
"Find files:" prompt :-).

So, I patched "Find files:" to enable completion. I find it useful,
and it makes the emacs user interface more consistent.

A patch against 5.7.6 is attached. As I am not a lisp expert, there
may be better ways to do this.

Regards,
  Tobias

gtags.el.patch
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