So it may be more consistent for the defaults to be:
<S-tab> aliased to backtab
<backtab> aliased to TAB
That seems plausible to me, in spirit, but I am not sure it is
possible. function-key-map operates just once on the input event
stream, and then key-translation-map operates once. It could be that
on some terminals S-tab is represented by an escape sequence which is
decoded by function-key-map, so there is no way to translate it twice
more.
Thus, clean as this is, we can't do it without creating some
new mechanism. And I don't think it's worth creating a new
mechanism just for this.
[I'm not even sure that maintaining a default aliasing of S-TAB -> TAB
is very important -- this feature is handy for the alphabetic keys for
several reasons, but I don't think it matters very much for keys like
TAB.]
I agree with that. It isn't crucial for either S-tab or backtab to
alias to TAB.
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