Instead of using auto-revert-mode or global-auto-revert-mode, we employ
lazy auto reverting on focus-in-hook, doom-switch-buffer-hook and
after-save-hook.
We do this because autorevert abuses inotify handles, which can grind
Emacs to a halt if you have hundreds of buffers open and something
performs expensive mtime or attribute-altering IO on their files outside
of Emacs. We only really need revert checks when we switch to or save a
buffer, or when we focus the Emacs frame.
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