Fix debbugs#20240 part two (jit-lock error during `comment-dwim').

jit-lock.el (jit-lock-after-change): Widen the buffer before
putting 'fontified text properties.

2 files changed, 15 insertions, 6 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 5757317f5e2..cab6abac615 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,10 @@
+2015-04-04  Alan Mackenzie  <acm@muc.de>
+
+        Fix debbugs#20240 part two (jit-lock error during `comment-dwim').
+
+        * jit-lock.el (jit-lock-after-change): Widen the buffer before
+        putting 'fontified text properties.
+
 2015-04-03  Michael Albinus  <michael.albinus@gmx.de>
 
         * net/tramp-cache.el (tramp-flush-file-property)
diff --git a/lisp/jit-lock.el b/lisp/jit-lock.el
index 0faabeb879a..d5651c62811 100644
--- a/lisp/jit-lock.el
+++ b/lisp/jit-lock.el
@@ -650,12 +650,14 @@ will take place when text is fontified stealthily."
     (let ((jit-lock-start start)
           (jit-lock-end end))
       (with-buffer-prepared-for-jit-lock
-          (run-hook-with-args 'jit-lock-after-change-extend-region-functions
-                              start end old-len)
-          ;; Make sure we change at least one char (in case of deletions).
-          (setq jit-lock-end (min (max jit-lock-end (1+ start)) (point-max)))
-          ;; Request refontification.
-          (put-text-property jit-lock-start jit-lock-end 'fontified nil))
+          (save-restriction
+            (widen)
+            (run-hook-with-args 'jit-lock-after-change-extend-region-functions
+                                start end old-len)
+            ;; Make sure we change at least one char (in case of deletions).
+            (setq jit-lock-end (min (max jit-lock-end (1+ start)) (point-max)))
+            ;; Request refontification.
+            (put-text-property jit-lock-start jit-lock-end 'fontified nil)))
       ;; Mark the change for deferred contextual refontification.
       (when jit-lock-context-unfontify-pos
         (setq jit-lock-context-unfontify-pos