Make the legend in describe-categories a link

* lisp/help-fns.el (describe-categories): Make the "see
bottom" text a link (bug#22227).

1 files changed, 8 insertions, 1 deletions

diff --git a/lisp/help-fns.el b/lisp/help-fns.el
index e17586c28fe..040152a2c9f 100644
--- a/lisp/help-fns.el
+++ b/lisp/help-fns.el
@@ -1109,7 +1109,13 @@ BUFFER should be a buffer or a buffer name."
       (if (or (not (vectorp docs)) (/= (length docs) 95))
           (error "Invalid first extra slot in this category table\n"))
       (with-current-buffer standard-output
-        (insert "Legend of category mnemonics (see the tail for the longer description)\n")
+        (setq-default help-button-cache (make-marker))
+        (insert "Legend of category mnemonics ")
+        (insert-button "(longer descriptions at the bottom)"
+                       'action help-button-cache
+                       'follow-link t
+                       'help-echo "mouse-2, RET: show full legend")
+        (insert "\n")
         (let ((pos (point)) (items 0) lines n)
           (dotimes (i 95)
             (if (aref docs i) (setq items (1+ items))))
@@ -1136,6 +1142,7 @@ BUFFER should be a buffer or a buffer name."
                 "character(s)\tcategory mnemonics\n"
                 "------------\t------------------")
         (describe-vector table 'help-describe-category-set)
+        (set-marker help-button-cache (point))
         (insert "Legend of category mnemonics:\n")
         (dotimes (i 95)
           (let ((elt (aref docs i)))