bug#53452: 29.0.50; C-<arrow> selection broken by translate-upper-case-key-bindings

[Robert Pluim <rpluim@gmail.com>]

>>>>> On Sat, 22 Jan 2022 21:18:11 +0200, Eli Zaretskii <eliz@gnu.org> said:

    >> Date: Sat, 22 Jan 2022 19:26:35 +0100
    >> From:  Ergus via "Bug reports for GNU Emacs,
    >> the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
    >> 
    >> When translate-upper-case-key-bindings is nil; the shift-arrow selection
    >> does not work
    >> 
    >> emacs -Q
    >> M-: (setq translate-upper-case-key-bindings nil)
    >> S-<right>  // says it is not bound... somehow expected.
    >> 
    >> M-: (keymap-global-set "S-<right>" #'right-char)
    >> S-<right>  // Now moves point but with no selection
    >> 
    >> I don't know where/how emacs recognizes the Shift in this case, but
    >> somehow it is not working

    Eli> It sounds like it cannot work in that case, because shift-select
    Eli> _requires_ that a key was shift-translated, and setting
    Eli> translate-upper-case-key-bindings to nil disables that translation.

The docstring says:
"If non-nil, interpret upper case keys as lower case (when applicable)."

which strongly implies that this only applies to letters, not keys
like <right>

Robert
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