bug#53202: [External] : Re: bug#53202: 27.2; Shift + function key not recognized

[Drew Adams]

> Perhaps MS-Windows treats F10 as a menu bar accelerator 
> and eats that key, like the PGTK build does.

Shift + F10 is special for MS Windows, it seems,
so it's plausible that it can't be available to
Emacs.  Confirmation would be good.

Note that <f10> itself can be bound in Emacs.
Likewise <M-f10> and <C-f10>.  It seems to be only
<S-f10> that's unavailable.

If that's the case, maybe some mention in the doc
would be good.  E.g., if some Shift combinations,
in particular, are sometimes not available on some
platforms, maybe mention that fact.

Or if this isn't particularly true of Shift, then
maybe just some mention somewhere that some key
sequences might not be available for Emacs on some
platforms.

And maybe tell users how to tell if a key isn't
available (e.g. if `C-h k' doesn't recognize the
key at all, that might well mean that there's no
way for Emacs to use it).