Default outline-minor-mode-use-buttons to only happen in *Help*

* lisp/outline.el (outline-minor-mode-use-buttons): Change the
default to only use buttons in the *Help* buffer (for now),
because it's too disruptive in other modes.  This will probably be
changed again to have some other mechanism to opt in in certain
modes, but it's not clear what that mechanism should look like.

diff --git a/lisp/outline.el b/lisp/outline.el
index 8132043097e21c300804000d85675669fe818828..bb62c573c407311965b133dbf27490cad3ac2b09 100644 (file)
--- a/lisp/outline.el
+++ b/lisp/outline.el
@@ -281,7 +281,7 @@ This option is only in effect when `outline-minor-mode-cycle' is non-nil."
   [outline-1 outline-2 outline-3 outline-4
    outline-5 outline-6 outline-7 outline-8])
 
-(defcustom outline-minor-mode-use-buttons '(derived-mode . special-mode)
+(defcustom outline-minor-mode-use-buttons '(derived-mode . help-mode)
   "Whether to display clickable buttons on the headings.
 The value should be a `buffer-match-p' condition.