* wl-vars.el (wl-summary-max-thread-depth): It can take nil.

diff --git a/wl/wl-vars.el b/wl/wl-vars.el
index b0de27d..ae99c86 100644 (file)
--- a/wl/wl-vars.el
+++ b/wl/wl-vars.el
@@ -1609,7 +1609,8 @@ with wl-highlight-folder-many-face."
 
 (defcustom wl-summary-max-thread-depth 30
   "*If thread depth of the message is larger than this value, divide it."
-  :type 'integer
+  :type '(choice (const :tag "Unlimited" nil)
+                integer)
   :group 'wl-summary
   :group 'wl-pref)