Don't forcibly turn on the mode upon load.
(icomplete-mode): Use define-minor-mode. (icomplete-eoinput): Default to nil. (icomplete-minibuffer-setup): Remove autoload. (icomplete-tidy): Simplify. (icomplete-exhibit): Use buffer-undo-list to determine if we're still in the initial state or if the user has modified the field. Fix handling of icomplete-max-delay-chars. Remove code that handles the oddball case where minibuffer-completion-table is an integer. Wrap icomplete-completions in while-no-input in case building completions takes more time than expected. (icomplete-completions): Simplify.
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