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Re: hi-lock-mode doesn't work with emacs -Q.

From: Stefan Monnier
Subject: Re: hi-lock-mode doesn't work with emacs -Q.
Date: Mon, 11 Jun 2007 16:25:14 -0400
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.1.50 (gnu/linux)

> .  Enable hi-lock-mode and make "foo" a highlightable pattern:

>     M-x hi-lock-mode
>     C-x w h foo<CR><CR>    ; accept the default hi-yellow face.

> .  This highlights the "foo" yellow, as expected.  At the end of the
> line, type:

>     foo

> .  This new "foo" doesn't get highlighted.  It should be.

I believe the patch below fixes the problem without making things worse and
without requiring changes to hi-lock.el.


--- font-lock.el        08 May 2007 11:55:52 -0400      1.317
+++ font-lock.el        11 Jun 2007 15:56:01 -0400      
@@ -698,6 +698,14 @@
         ;; contain the new keywords.
         (font-lock-update-removed-keyword-alist mode keywords how))
+         (when (and font-lock-mode
+                    (not (or font-lock-keywords font-lock-defaults)))
+           ;; The major mode has not set any keywords, so when we enabled
+           ;; font-lock-mode it only enabled the font-core.el part, not the
+           ;; font-lock-mode-internal.  Try again.
+           (font-lock-mode -1)
+           (set (make-local-variable 'font-lock-defaults) '(nil t))
+           (font-lock-mode 1))
         ;; Otherwise set or add the keywords now.
         ;; This is a no-op if it has been done already in this buffer
         ;; for the correct major mode.

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