org-crypt: when running `org-decrypt-entry', only run `auto-save-mode' check if on an encrypted entry

* lisp/org-crypt.el (org-crypt-check-auto-save): New function, see next change.
* lisp/org-crypt.el (org-decrypt-entry): Break the auto-save-mode check out
  into a separate function, and call it at a later point, to assure it only
  runs when visiting an encrypted entry.

Currently `org-decrypt-entry' is doing the auto-save-mode check whenever
it's run, regardless of context, while this only makes sense when run on
an entry which is actually encrypted (or looks like it, at least).

TINYCHANGE

lisp/org-crypt.el

@@ -116,6 +116,35 @@ nil      : Leave auto-save-mode enabled.
                  (const :tag "Ask"     ask)
                  (const :tag "Encrypt" encrypt)))
 
+(defun org-crypt-check-auto-save ()
+  "Check whether auto-save-mode is enabled for the current buffer.
+
+`auto-save-mode' may cause leakage when decrypting entries, so
+check whether it's enabled, and decide what to do about it.
+
+See `org-crypt-disable-auto-save'."
+  (when buffer-auto-save-file-name
+    (cond
+     ((or
+       (eq org-crypt-disable-auto-save t)
+       (and
+	(eq org-crypt-disable-auto-save 'ask)
+	(y-or-n-p "org-decrypt: auto-save-mode may cause leakage. Disable it for current buffer? ")))
+      (message (concat "org-decrypt: Disabling auto-save-mode for " (or (buffer-file-name) (current-buffer))))
+      ; The argument to auto-save-mode has to be "-1", since
+      ; giving a "nil" argument toggles instead of disabling.
+      (auto-save-mode -1))
+     ((eq org-crypt-disable-auto-save nil)
+      (message "org-decrypt: Decrypting entry with auto-save-mode enabled. This may cause leakage."))
+     ((eq org-crypt-disable-auto-save 'encrypt)
+      (message "org-decrypt: Enabling re-encryption on auto-save.")
+      (add-hook 'auto-save-hook
+		(lambda ()
+		  (message "org-crypt: Re-encrypting all decrypted entries due to auto-save.")
+		  (org-encrypt-entries))
+		nil t))
+     (t nil))))
+
 (defun org-crypt-key-for-heading ()
   "Return the encryption key for the current heading."
   (save-excursion
@@ -164,30 +193,6 @@ nil      : Leave auto-save-mode enabled.
 (defun org-decrypt-entry ()
   "Decrypt the content of the current headline."
   (interactive)
-
-  ; auto-save-mode may cause leakage, so check whether it's enabled.
-  (when buffer-auto-save-file-name
-    (cond
-     ((or
-       (eq org-crypt-disable-auto-save t)
-       (and
-        (eq org-crypt-disable-auto-save 'ask)
-        (y-or-n-p "org-decrypt: auto-save-mode may cause leakage. Disable it for current buffer? ")))
-      (message (concat "org-decrypt: Disabling auto-save-mode for " (or (buffer-file-name) (current-buffer))))
-      ; The argument to auto-save-mode has to be "-1", since
-      ; giving a "nil" argument toggles instead of disabling.
-      (auto-save-mode -1))
-     ((eq org-crypt-disable-auto-save nil)
-      (message "org-decrypt: Decrypting entry with auto-save-mode enabled. This may cause leakage."))
-     ((eq org-crypt-disable-auto-save 'encrypt)
-      (message "org-decrypt: Enabling re-encryption on auto-save.")
-      (add-hook 'auto-save-hook
-                (lambda ()
-                  (message "org-crypt: Re-encrypting all decrypted entries due to auto-save.")
-                  (org-encrypt-entries))
-                nil t))
-     (t nil)))
-
   (require 'epg)
   (unless (org-before-first-heading-p)
     (save-excursion
@@ -199,6 +204,7 @@ nil      : Leave auto-save-mode enabled.
 	       (outline-invisible-p))))
 	(forward-line)
 	(when (looking-at "-----BEGIN PGP MESSAGE-----")
+	  (org-crypt-check-auto-save)
 	  (let* ((end (save-excursion
 			(search-forward "-----END PGP MESSAGE-----")
 			(forward-line)