bug#17210: 24.3.50; help mode [back] link to a C-h b keybind listing fails with message "Current buffer is not in Help mode"

[martin rudalics]

> If "back" doesn't get you back, then it isn't really a solution, is
> it?

My first conclusion was wrong.  "back" gets me the right buffer but it
gives me different contents.  After C-h b my first 12 lines of the
*Help* buffer are


Key translations:
key             binding
---             -------

C-x             Prefix Command
<double-down-mouse-1> mouse--down-1-maybe-follows-link
<down-mouse-1>    mouse--down-1-maybe-follows-link

C-x 8           iso-transl-ctl-x-8-map

C-x 8 SPC       
...


and *Help* has 1050 lines while after going to some function and hitting
"back" these lines are


Key translations:
key             binding
---             -------

C-x             Prefix Command
A-SPC           
A-!             ¡
A-"                Prefix Command
A-$             ¤
A-'             Prefix Command
A-*             Prefix Command
A-+             ±
...


and *Help* has 1637 lines.  Confusing.  I think I'll have to debug
`describe-buffer-bindings' to find out what happens.

martin