Patch: Info-mode bindings for forward and back mouse buttons

[Teddy Hogeborn]

When using a common type of mouse with two normal buttons, a scroll
wheel, and two side thumb buttons for "forward" and "back", the last
two buttons are not bound in Info-mode.  Patch below.

(As the buttons are not currently bound to anything, I assume that it
is not crucial to make absolutely sure that mouse-6 and mouse-7 have
no other meaning on some other type of mouse.)

Someone might argue that this should instead be part of mwheel.el, and
I have no opinion on that, as long as the buttons work by default.

/Teddy

Index: lisp/info.el
===================================================================
RCS file: /sources/emacs/emacs/lisp/info.el,v
retrieving revision 1.497
diff -c -r1.497 info.el
*** lisp/info.el        10 Feb 2007 11:10:49 -0000      1.497
--- lisp/info.el        20 Mar 2007 20:07:17 -0000
***************
*** 3173,3178 ****
--- 3173,3180 ----
    (define-key Info-mode-map "," 'Info-index-next)
    (define-key Info-mode-map "\177" 'Info-scroll-down)
    (define-key Info-mode-map [mouse-2] 'Info-mouse-follow-nearest-node)
+   (define-key Info-mode-map [mouse-6] 'Info-history-forward)
+   (define-key Info-mode-map [mouse-7] 'Info-history-back)
    (define-key Info-mode-map [follow-link] 'mouse-face)
    )