Re: Raw keys in C-h k and C-h c

[Richard Stallman]

    > It sounds somewhat arbitrary (under my xterm M-U is seen by Emacs
    > as ESC U, among other things), but I guess it's good enough.

    To let cases like "ESC U" through, we could only filter out escape 
    sequences whose length is more than 2.  Function keys are almost always 
    longer that 2 characters, I think.

Emacs does not translate ESC U to Meta-U through function-key-map.
ESC is an ordinary prefix key in that context.  So I would expect that
sequences such as ESC U won't be picked up by this code anyway.

    > Two users here using my hacked Emacs already thanked me for it, saying
    > "I wish it had been there when I played with my xterm/console settings to
    > send more function key sequences".

    I agree that having that display is a valuable debugging option.  Perhaps 
    we could have that with some modification of "C-h c", like when it's 
    invoked with an arg.

Since other people found it useful, I agree with that.