(show-ifdefs, hide-ifdefs): Bind inhibit-read-only.
Set buffer-read-only directly. (hide-ifdef-block): Likewise. (show-ifdef-block): Bind inhibit-read-only; don't set buffer-read-only. Delete bindings for C-c C-f, C-c C-b, C-c C-u, C-c C-d, C-c C-p and C-c C-n. Move C-c C-h to C-c C-d. (define-hide-ifdef-mode-map): Remove this code from a function and execute it at load time. (hide-ifdef-mode-submap): New variable holds the list of commands. (hide-ifdef-mode-map): Set this up with a prefix key and put it in minor-mode-map-alist. (hide-ifdef-mode-map-before): Variable deleted. (hide-ifdef-mode): Use force-mode-line-update. Delete the code to manipulate keymaps. (define-hide-ifdef-mode-map): Pass (keymap) as KEYMAP arg to where-is-internal.
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