How can I get mouse selection to work in emacs and iTerm2 on Mac?

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For Emacs in iTerm 2, I’ve found that the following bit in my ~/.emacs file works very well, providing the ability to insert the character at an arbitrary location, mark a region, and use the scroll wheel:

;; Enable mouse support
(unless window-system
  (require 'mouse)
  (xterm-mouse-mode t)
  (global-set-key [mouse-4] (lambda ()
                              (interactive)
                              (scroll-down 1)))
  (global-set-key [mouse-5] (lambda ()
                              (interactive)
                              (scroll-up 1)))
  (defun track-mouse (e))
  (setq mouse-sel-mode t)
)

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