bug#36767: 26.1; request: add more quick keys to the *Help* buffer

[martin rudalics]

> Thanks.  But what I'd like to have is not a way of burying the Help
> window, because I frequently need to consult it for quite some time.
> What I'd like to have is a way of using its buttons without going to
> that other window first.  For example, I'd love a command, bound to a
> key globally, that would display the source of the function in the
> same window as the Help window, then allow me to go back to the Help
> window.

The attached is an attempt to do that.  Buggy and the nomenclature is
immature but I hope you get the idea.

martin

help-mode.diff
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