bug#13451: 24.3.50; doc of `window-persistent-parameters' and window parameters generally

[Drew Adams <drew.adams@oracle.com>]

>  > I'm looking for information about window configurations and what
>  > gets saved/restored etc.
>  >
>  > I do `C-h v window-persistent-parameters', and I see that the current
>  > value, which is apparently the default, is ((clone-of . t)).
>  >
>  > Naturally, I want to know what this means, so I read the rest of the
>  > *Help* buffer.  Nada.  Well, the `t' is explained, but not the
>  > `clone-of'.  Not very helpful help.
>  >
>  > So I search the Elisp manual.  I come across nodes `Window
>  > Configurations' and `Window Parameters'.  The latter, in particular,
>  > seems like it should list the possible parameters, including `clone-of',
>  > which is the parameter saved in a window config by default.
>  >
>  > Nada.  Again, the CDR of `window-persistent-parameters' is described
>  > (possible values nil, t, writable), but nothing about the CAR - its
>  > possible values.  Again, not very helpful help.
>  >
>  > Please document the possible values for the CAR, at least the most
>  > common ones, and at the very least `clone-of', which is apparently the
>  > only one saved/restored by default (at least on MS Windows).
>  >
>  > Please describe the window parameters: what they are, what behaviors they
>  > affect, and how.  Describing a window configuration as a saved set of
>  > window parameters is not very useful if one cannot find out what the
>  > parameters are or what they do.
> 
> I'm not sure what to do.  If there is something particular that is
> unclear or you don't understand, please point that out.  The CAR of a
> `window-persistent-parameters' entry specifies the parameter that shall
> be treated specially.  What more do you want me to say about it?  The
> `clone-of' parameter is used by the window code itself and the manual
> tells so.  If there's anything particular the user or application
> programmer should know, the manual will have to be rewritten.  Currently
> there isn't.

I think the request is pretty clear:

  Please document the possible values for the CAR [of
  `window-persistent-parameters'], at least the most common ones, and at the
  very least `clone-of', which is apparently the only one saved/restored by
  default (at least on MS Windows).

  Please describe the window parameters: what they are, what behaviors they
  affect, and how.  Describing a window configuration as a saved set of
  window parameters is not very useful if one cannot find out what the
  parameters are or what they do.

That's what to do.  Thx.