Include EN DASH as an indentation character

* textmodes/fill.el (adaptive-fill-regexp): Include EN DASH as an
indentation character.

Fixes: debbugs:6380

lisp/ChangeLog

@@ -1,5 +1,8 @@
 2011-07-16  Lars Magne Ingebrigtsen  <larsi@gnus.org>
 
+	* textmodes/fill.el (adaptive-fill-regexp): Include EN DASH as an
+	indentation character (bug#6380).
+
 	* files.el (buffer-offer-save): Made permanently local (bug#6241).
 
 	* doc-view.el (doc-view-make-safe-dir): Rewrite the error message

lisp/textmodes/fill.el

@@ -93,7 +93,7 @@ reinserts the fill prefix in each resulting line."
   ;; Added `!' for doxygen comments starting with `//!' or `/*!'.
   ;; Added `%' for TeX comments.
   ;; RMS: deleted the code to match `1.' and `(1)'.
-  (purecopy "[ \t]*\\([-!|#%;>*·•‣⁃◦]+[ \t]*\\)*")
+  (purecopy "[ \t]*\\([-–!|#%;>*·•‣⁃◦]+[ \t]*\\)*")
   "Regexp to match text at start of line that constitutes indentation.
 If Adaptive Fill mode is enabled, a prefix matching this pattern
 on the first and second lines of a paragraph is used as the