bug#1744: bug-reference-mode doesn't fontify when called from mode hook

[Glenn Morris]

Juri Linkov wrote:

>   (add-hook 'change-log-mode-hook 'bug-reference-mode)
>
> and a file local variable `bug-reference-url-format'
> in the ChangeLog file:
[...]
> bug references never get fontified because `bug-reference-mode' tests
> whether a variable `bug-reference-url-format' is non-nil before calling
> `(jit-lock-register #'bug-reference-fontify)' in `bug-reference-mode',
> and this variable is not yet set because it gets initialized later
> in `hack-local-variables' called after `set-auto-mode' in `normal-mode'.


This reminds me a bit of bug#347. How about something like this:


*** bug-reference.el    5 Jan 2009 03:23:16 -0000       1.6
--- bug-reference.el    9 Jan 2009 01:47:30 -0000
***************
*** 114,121 ****
    ""
    nil
    (if bug-reference-mode
        (when bug-reference-url-format
!       (jit-lock-register #'bug-reference-fontify))
      (jit-lock-unregister #'bug-reference-fontify)
      (save-restriction
        (widen)
--- 114,125 ----
    ""
    nil
    (if bug-reference-mode
+       (progn
+       (let ((enable-local-variables :safe)
+             (enable-local-eval nil))
+         (hack-local-variables))
        (when bug-reference-url-format
!         (jit-lock-register #'bug-reference-fontify)))
      (jit-lock-unregister #'bug-reference-fontify)
      (save-restriction
        (widen)