(cua--preserve-mark-commands): New defvar.
Init to beginning-of-buffer and end-of-buffer. (cua--undo-push-mark): New defvar. (cua--pre-command-handler): Set inhibit-mark-movement if mark is already active and command is in cua--preserve-mark-commands. Also fix check for shift modifier on non-window systems. (cua--post-command-handler): Clear inhibit-mark-movement if set.
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