bug#25840: 26.0.50; mouse wheel scrolling appears to be disabled

[Sam Steingold <sds@gnu.org>]

emacs -Q
scroll with two fingers on the touchpad.
get the "wheel is undefined" messages (see below).
works in other applications (e.g., chrome).
worked in the last week build.


In GNU Emacs 26.0.50 (build 4, x86_64-apple-darwin16.4.0, NS appkit-1504.81 Version 10.12.3 (Build 16D32))
 of 2017-02-21 built on clr-sds
Repository revision: 96cea19842b577eb4f2e057d702aea54d736233e
Windowing system distributor 'Apple', version 10.3.1504
Recent messages:
Opening nndoc server on nndoc:gmane.comp.security.risks-771-ephemeral...done
<wheel-up> is undefined
<double-wheel-up> is undefined
<triple-wheel-up> is undefined [3 times]
<wheel-down> is undefined
<wheel-right> is undefined
<wheel-down> is undefined
<double-wheel-down> is undefined

Configured using:
 'configure --with-ns
 PKG_CONFIG_PATH=/usr/local/opt/libxml2/lib/pkgconfig:/usr/local/opt/imagemagick/lib/pkgconfig/'

Configured features:
NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS

Important settings:
  value of $LANG: C
  locale-coding-system: utf-8-unix

Major mode: Summary

Minor modes in effect:
  hl-line-mode: t
  global-edit-server-edit-mode: t
  diff-auto-refine-mode: t
  pyvenv-mode: t
  rcirc-track-minor-mode: t
  which-function-mode: t
  url-handler-mode: t
  show-paren-mode: t
  desktop-save-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t

Load-path shadows:
/Users/sds/.emacs.d/elpa/scala-mode-20161122.2325/ob-scala hides /Users/sds/src/emacs/trunk/lisp/org/ob-scala

Features:
(shadow emacsbug image-mode pulse edebug js ein-ipynb-mode cal-move
cal-x cal-china ...)

Memory information:
((conses 16 1196278 161232)
 (symbols 48 60166 16)
 (miscs 40 9883 2771)
 (strings 32 260881 10679)
 (string-bytes 1 7084391)
 (vectors 16 106727)
 (vector-slots 8 2534105 206952)
 (floats 8 1516 2703)
 (intervals 56 57850 3952)
 (buffers 976 169))

-- 
Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.1504
http://steingoldpsychology.com http://www.childpsy.net http://www.memritv.org
http://think-israel.org http://mideasttruth.com https://ffii.org
Suppose there is no empty set. Then consider the set of all empty sets.