Introduce new defcustom for terminal CUA rectangle commands
This allows a user to set a non-meta modifier for their terminal should his/her terminal support it. See bug#35058 for background on this change. * lisp/emulation/cua-base.el (cua-rectangle-terminal-modifier-key): New defcustom. * lisp/emulation/cua-base.el (cua--shift-control-x-prefix): Use new defcustom.
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