RE: [External] : Control help- and Info-mode buffers from other buffers

[Drew Adams]

Apologies for not taking the time to look into the details of what you propose. 
 Some quick feedback:
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As one user, I use (special-display) frames for *Help*, *info*, *Man*, 
*Completions*, etc. (all buffers named `*...*', in fact).

1. Please make your feature work with (such) frames, and not just with windows 
in the selected frame.

E.g., pass a non-nil ALL-FRAMES arg to `get-buffer-window'.  (The arg should be 
0, `visible', or t, not a frame.  I'd vote for t.)

2. FWIW, in my use *Help* is no different from *info* (and *Man __*), in the 
sense that I can have multiple Help buffers just as I can have multiple Info 
(and *Man __* buffers).

Only one of the Help buffers is named *Help*, just as only one of the Info 
buffers is named *info* (e.g. `M-n' in Info gives you *info*<N> etc.).  A Help 
command shows buffer *Help*, an Info command shows buffer *info*, etc.

3. I think that this kind of error msg might need correcting, depending on what 
non-nil value you decide to pass to `get-buffer-window':

  "There is no visible Info buffer"
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4. FWIW, it would be much easier to eyeball your patch if you used a unified 
diff (`diff -u').  There's a lot of code that is, I think, unchanged other than 
being wrapped with some code - only the wrapper was added.  But it's hard to 
see the real differences (the wrappers).  Eyeballing the patch helps those 
(like me) who have code similar to that in, say, info.el and will need to 
update it to accommodate this change.

Thx.