(hide-ifdef-mode): Only modify

`change-major-mode-hook' locally.  Reset invisibility spec.

1 files changed, 3 insertions, 1 deletions

diff --git a/lisp/progmodes/hideif.el b/lisp/progmodes/hideif.el
index ab7aad28931..ba12b7cbffd 100644
--- a/lisp/progmodes/hideif.el
+++ b/lisp/progmodes/hideif.el
@@ -207,7 +207,8 @@ how the hiding is done:
              (default-value 'hide-ifdef-hiding))
         (set (make-local-variable 'hif-outside-read-only) buffer-read-only)
         (set (make-local-variable 'line-move-ignore-invisible) t)
-        (add-hook 'change-major-mode-hook (lambda () (hide-ifdef-mode -1)))
+        (add-hook 'change-major-mode-hook
+                  (lambda () (hide-ifdef-mode -1)) nil t)
 
         (add-to-invisibility-spec '(hide-ifdef . t))
 
@@ -216,6 +217,7 @@ how the hiding is done:
           (show-ifdefs)))
     ;; else end hide-ifdef-mode
     (kill-local-variable 'line-move-ignore-invisible)
+    (remove-from-invisibility-spec '(hide-ifdef . t))
     (if hide-ifdef-hiding
         (show-ifdefs))))